⚡ Quick Answer: How to Draft a Vest Pattern
Drafting a vest pattern means drawing the back and the front on paper from six measurements, then trusting the paper enough to cut a calico toile before the fashion fabric. Take the full bust, the waist, the hip, the shoulder width, the nape to waist length and the finished vest length, add between 2 and 4 inches of ease at the bust depending on what you wear underneath, and divide the bust plus ease by four for each panel. The back is a rectangle 22 inches long and 10 1/4 inches wide for a 38 inch bust, the front is half an inch wider at the centre, and the shoulder seam on both panels has to finish at exactly the same length or the vest will drag at the neck.
Most instructions for this project jump straight into drawing curves without saying where the first line goes or why, which is why a first draft usually ends with an armhole that cuts into the arm and a centre front that swings away from the body. Every one of those faults traces back to a single line placed with the wrong number, and every one of them is visible on a toile before a metre of good wool gets cut.
This guide works through the draft in eight steps with a worked example for a 38 inch bust, gives the ease figures for three layering depths, compares drafting on a dartless block, a darted sloper and bare paper, and finishes with a table of faults and the line that caused each one.
What a Vest Pattern Has to Do
A vest is the simplest fitted garment to draft because it has no sleeves and no collar to match, and the hardest to fit because there is nothing to hide behind. It sits close at the waist, opens at the armhole, and shows the whole shoulder line, so a shoulder that is half an inch out is visible from across a room. That is also why it makes such a good first drafting project: the feedback is immediate and the fixes are small.
The pattern does three jobs at once. It holds the bust and the waist in the right relationship, it keeps the armhole deep enough to raise an arm and shallow enough to look like it was drafted on purpose, and it gives the front edge a line that hangs straight from the neck to the hem. When those three work, the vest can be made in wool, denim, brocade or quilted cotton and still fit, because the fabric never had to rescue the shape.
A vest that fits is drafted twice: once on paper and once in calico. The toile is not an optional extra, it is the second half of the pattern.
| What the paper decides | What happens on the body if it is wrong | Where it is fixed |
|---|---|---|
| Bust and waist relationship | Pulls across the chest or stands away at the waist | Step 5, front width |
| Armhole depth | Cuts into the arm, or gapes at the front | Step 6, underarm point |
| Shoulder length and slope | Seam slides off, neck drags | Step 6, shoulder line |
| Front edge line | Centre front swings out or in | Step 5, centre front |
| Hem line | Vest shorter at the front than the back | Step 8, hem allowance |
What You Need on the Table
Paper is the first decision, and it matters more than the brand of ruler. Buy a roll of pattern paper or use kraft paper in sheets long enough for the full vest length plus seam allowance, because a draft drawn across two taped sheets develops a kink exactly where the waist line has to be straight. A long clear ruler that spans the width of the panel keeps the centre lines and the waist line parallel, which is the single most common drafting error.
The french curve is the only shaped tool you need, and a hip curve is the better version of it because it draws a longer armhole and a smoother hem. If neither is to hand, a dinner plate draws a serviceable armhole curve and a large tin lid does the hem. What is not negotiable is a tape measure that has been checked against a steel rule, because a cheap tape that has stretched by a quarter of an inch will put every measurement out by the same amount.
| Tool | What it does in this draft | A substitute that works |
|---|---|---|
| Pattern paper | Takes the full length without a join | Kraft paper, back of wallpaper |
| Long clear ruler | Keeps centre lines and waist lines square | Any 24 inch metal rule |
| French curve or hip curve | Draws the armhole and the front neckline | Dinner plate, large lid |
| Tape measure | All six body measurements | A checked dressmaker tape only |
| Pencil and eraser | Every line is provisional until the toile | 2H pencil, soft eraser |
| Paper scissors | Cuts the pattern, never the fabric | Any pair kept for paper only |
Step 1: Take Six Measurements
Measure over the clothes you will wear under the vest, with your arms down and your weight even on both feet. A friend reading the tape is worth more than any tool, because the moment you turn to look at the number your ribcage lifts and the bust measurement shrinks by half an inch. Write every number down before taking the next one.
Six measurements do the whole draft: full bust, natural waist, hip, shoulder width, nape to waist, and finished vest length. Two more are optional and worth having: the bust span from apex to apex, which positions a dart, and the front length from the shoulder line over the bust to the waist, which catches a figure that needs more length in front than at the back.
| Measurement | How to take it | Worked example |
|---|---|---|
| Full bust | Around the fullest part, tape level at the back | 38 in |
| Natural waist | The narrowest point, over the shirt | 31 in |
| Hip | 8 inches below the waist | 40 in, long vests only |
| Shoulder width | Shoulder tip to shoulder tip across the back | 15 in |
| Nape to waist | The bone at the back of the neck to the waist tape | 16 in |
| Vest length | Nape to the hem you want | 22 in |
| Bust span | Apex to apex, optional | 8 in |
| Front length | Shoulder line over the bust to the waist, optional | 17 in |
Step 2: Add Ease for What Goes Underneath
Ease is the extra room that lets the vest close over whatever is underneath and still let you breathe out. It is added once, at the bust, and divided with the rest of the measurement, so a quarter of the total ease goes onto each panel edge. Getting it wrong is the reason a vest that looked right on paper will not button over a jumper.
The layer underneath sets the number. A vest worn over a blouse takes 2 inches at the bust and 1 inch at the waist. Over a jumper or a hoodie it needs 4 inches at the bust and 2 at the waist. Over a jacket, which is a rare but real choice, it takes 5 to 6 inches at the bust and 2 to 3 at the waist, and at that point it stops being a fitted garment and becomes outerwear with a different draft.
| What you wear under it | Bust ease | Waist ease |
|---|---|---|
| Blouse or T-shirt, close and tailored | 2 in | 1 in |
| Jumper or hoodie, relaxed and layerable | 4 in | 2 in |
| Jacket or blazer, outerwear that hangs away | 5 to 6 in | 2 to 3 in |
| Nothing, summer cotton, needs a stable fabric | 1 1/2 in | 1/2 in |
Step 3: Choose the Base You Draft On
There are three honest ways to start, and the right one depends on what is already in the sewing room. If you own a bodice block that fits, draft the vest on top of it: trace the block, shorten it at the hem, deepen the armhole by half an inch and redraw the neckline. If you own a darted sloper, do the same and keep the bust dart as it is, because the vest needs that shaping more than a blouse does.
If you own neither, draft from the measurements in Steps 4 and 5. It is not a lesser method, it is just more arithmetic, and it has one advantage: every line is a number you can check rather than a curve you inherited from someone else’s block.
Which Base to Use First
Start with the block if you have one, even if it is a size out, because adjusting a block you understand is quicker than starting from bare numbers. Draft on bare paper when the block is for a different garment type, when the bust dart sits in a place you do not want, or when the block is more than one size away from the body. Both routes meet at the same place in Step 6, where the panels are checked against each other, and that check is what makes either draft wearable.
Step 4: Draft the Back Panel
Draw the centre back line first, the full vest length plus 1 inch at the hem. Every horizontal line on the back squares off that line, and every one of them is measured from the nape, so the armhole depth and the waist line stay in the right relationship even if the body is short or long in the torso.
The back is a quarter of the bust plus ease, measured out from the centre back. At 38 inches of bust with 2 inches of ease, that is 40 divided by 4, which is 10 inches, and then the seam allowance is added later at Step 8 rather than now. The waist dart takes an inch out of the back at the waist line, which is what turns a rectangle into a shape.
| Line | Where it goes | Worked example |
|---|---|---|
| Centre back | Vertical, full length plus hem allowance | 23 in |
| Back width | Square out from centre back, quarter of bust plus ease | 10 in |
| Nape to waist | Horizontal from centre back at the waist | 16 in from the nape |
| Armhole depth | Horizontal from centre back down from the nape | 8 1/2 in |
| Neck width | Along the top edge from the centre back | 2 3/4 in |
| Neck drop | Down the centre back from the top edge | 3/4 in |
| Shoulder drop | At the shoulder tip, below the top edge | 1 1/2 in |
| Waist dart | Centred on the back width, at the waist line | 1 in total |
Step 5: Draft the Front Panel
The front is drawn the same way from a centre front line, with one difference: it is half an inch wider than the back at the side seam, because the bust needs more room at the front than the shoulder blades need at the back. On the worked example that makes the front 10 1/2 inches from centre front to side seam, and that half inch is the whole reason a vest closes flat instead of pulling open between the buttons.
The neckline is where the style is chosen. A V neck drops 3 1/2 inches or more from the centre front and meets the shoulder line at the neck width, a high neck drops 1 1/2 inches, and a curved scoop sits between the two. Whatever shape is chosen, the neck width at the shoulder has to match the back exactly, or the seam will not sit flat when the two panels are joined.
| Line | Where it goes | Worked example |
|---|---|---|
| Centre front | Vertical, full length plus hem allowance | 23 in |
| Front width | Square out from centre front, quarter of bust plus ease plus 1/2 in | 10 1/2 in |
| Front neck drop | Down the centre front from the top edge | 3 1/2 in for a V neck |
| Neck width | Along the top edge from the centre front | 2 3/4 in, matching the back |
| Shoulder drop | At the shoulder tip, below the top edge | 1 3/4 in |
| Bust dart intake | From the side seam, pointing at the apex | 1 1/2 to 2 in |
| Closure extension | Beyond the centre front, if the vest buttons | 1 in |
Step 6: Match the Shoulder, the Armhole and the Neck
Lay the two panels side by side and check three things before going any further. The shoulder seam on the front, minus any dart taken out of it, must measure the same as the shoulder seam on the back. The armhole depth on both panels must be measured from the same nape line, not from the top edge of each sheet of paper. And the side seam on the front must be the same length as the side seam on the back, or the hem will sit crooked when the two are joined.
If the shoulders do not match, correct the front rather than the back, because the back was drafted from the centre back which is a fixed line. If the side seams differ by more than a quarter of an inch, the front armhole point is in the wrong place and should be raised or lowered until the seam lengths agree.
The armhole curve itself is the last thing to draw, because it is the line most likely to move and the one that changes the whole fit. Join the shoulder tip to the underarm point with a curve that is nearly straight for the first inch, then bends into the underarm. Drawing it freehand in one sweep usually produces a curve that is too deep at the front, which is what makes the armhole gape when a vest is worn open.
Step 7: Add the Shaping, Darts or a Princess Seam
A dart is the fast route. The intake comes off the side seam, points at the apex but stops an inch short of it, and is worth 1 1/2 to 2 inches on a 38 inch bust. Sewn into a vest, the dart is hidden under the arm and invisible from the front, which is why most first drafts use it.
A princess seam is the flatter route. The panel is cut apart along a line from the armhole through the apex and down to the hem, and the shaping is transferred into that seam. It gives a longer, cleaner line on a fitted vest and it is easier to alter later, because the seam can be taken in without touching the armhole or the neckline. The trade is an extra seam to sew and an extra 5/8 inch of seam allowance on both sides of it.
Step 8: Add Seam Allowance and Cut a Toile
Add the seam allowance last, and add it consistently: 5/8 inch on every seam, 1 inch at the hem, 1 1/2 inches at the centre back so the vest can be let out later, and 3/8 inch around the neckline and the armhole if the vest will be lined. Write the amount on each edge of the pattern as it is added, because the one edge that gets forgotten is always the centre back.
Cut the toile in calico or an old bedsheet and mark the centre front and centre back in thread rather than chalk, since chalk rubs off at exactly the moment it is needed. Sew the toile with the seams at 5/8 inch, press them open, and try it on over the clothes it was drafted for.
Three checks decide whether the pattern is finished. The centre front should hang vertical and parallel to the floor, the shoulder seam should sit on the shoulder tip with no overhang, and the armhole should clear the arm by about half an inch when it is raised. If all three hold, the pattern is ready for fabric; if one fails, the fault table below says which line to move.
Common Drafting Faults and What They Look Like
Almost every drafting fault shows up on the body as a pull, a gap or a swing, and each of those points at one line on the paper. The table below is the one worth keeping beside the sewing machine, because it turns a vague “this does not feel right” into a specific number to change.
| What you see on the body | What the paper did | The correction |
|---|---|---|
| Armhole cuts into the arm | Front armhole too deep | Raise the underarm point 1/2 in |
| Shoulder seam slides off the shoulder | Shoulder slope too steep | Flatten the tip by 1/4 in |
| Pulls across the bust | Not enough ease or dart intake | Add 1/2 in of ease or 1/4 in of dart |
| Centre front swings away from the body | Front too wide at the bust | Take 1/2 in off the front side seam |
| Back neck stands away | Nape drop too deep | Raise the back neckline 1/2 in |
| Diagonal drags from the armhole to the bust | Armhole too high or too tight | Lower the underarm point 1/4 in |
| Hem rises at the front | Front panel shorter than the back | Add the difference to the front hem |
| Waist gapes at the back | Waist dart too small | Increase the dart by 1/2 in |
Two faults account for most first drafts: an underarm point set half an inch too low, and a front shoulder an eighth of an inch longer than the back. Check those first.
How to Sew the Vest You Just Drafted
Interface the front panels and the neckline before anything else, because a vest hangs from its front edge and an uninterfaced edge will stretch the first time it is pressed. Sew the darts first, then the shoulder seams, then the side seams, pressing each one open as it is finished rather than at the end.
A lined vest is easier than it looks and it finishes the inside properly. Sew the main fabric and the lining separately at the shoulders, put them right sides together, stitch all the way round the front edge, the neckline and both armholes, then turn the whole vest through the side seam opening and stitch the side seams last. The guide to sewing a quilted vest shows the same order on a bulkier fabric, and the method for sewing a bolero jacket is the version with sleeves attached.
For a shaped front, the princess seam dress guide covers how the seam is sewn and pressed so that it curves without puckering. If the armhole needs to be deeper or the curve is fighting the arm, the square armhole sleeve notes explain where the underarm point sits on a shaped armhole, and the french curve adjustment guide shows how to move a curve without redrawing the whole panel.
Frequently Asked Questions
Can I draft a vest pattern without a bodice block?
Yes. The draft in Steps 4 and 5 needs six measurements and no block at all. A block saves time because the curves are already tested, but it is not a requirement, and many people find drafting from bare numbers easier to check because every line is a figure they wrote down.
How much ease should a vest have?
Two inches at the bust and one inch at the waist over a blouse, four inches at the bust over a jumper, and five to six inches if the vest goes over a jacket. Ease is added once at the bust and divided with the panel width, so a quarter of the total lands on each edge.
What is the difference between a vest and a waistcoat pattern?
Nothing structural. Waistcoat is the older British name for the same garment, and a waistcoat pattern is drafted with the same panels, armholes and closure. The word tends to describe a more formal, pointed-hem version, but the draft is the same.
Should I cut the back on a fold?
A close-fitting vest is better with a centre back seam, because the seam lets the back be shaped at the waist and taken in later. A centre back seam also gives 1 1/2 inches to work with if the vest is ever let out. Cut on the fold only for a boxy, unfitted shape.
How deep should the armhole be?
About 8 1/2 inches down from the nape for a 38 inch bust, which puts the underarm point roughly an inch below the armpit. It should clear the arm by half an inch when the arm is raised, and no more, or the front will gape when the vest is worn open.
Do I need a toile for a vest?
A vest has no sleeves to distract from a bad shoulder, so the toile is worth the hour. Calico or an old sheet is enough. Mark the centre lines in thread, sew the seams and check three things: the centre front hangs vertical, the shoulder seam sits on the tip, and the armhole clears the arm.
What fabric is best for a first vest?
A medium weight woven with some body: wool suiting, cotton twill, denim, corduroy or brocade. Avoid loose weaves and anything with stretch, because both will show every drafting error. A quilting cotton is fine for a summer vest and is the cheapest way to test a new pattern.
How much fabric does a vest need?
About 1 yard of 60 inch wide fabric for a waist length vest in the smaller sizes, and 1 1/2 yards for a longer vest or a larger size, plus the same amount again for a full lining. Narrow fabric at 45 inches needs a metre and a half for most sizes.
How do I fix a vest that gapes at the armhole?
The front armhole is too deep. Raise the underarm point by half an inch, redraw the curve, and check the front side seam still matches the back. If the gap only appears when the vest is worn open, the fix is a small shoulder dart or a narrower neckline rather than the armhole.
Can I add pockets to the draft?
Yes, and the draft is the right place to do it, because pocket placement is a proportion decision rather than a sewing one. Mark the welt or patch position on the front panel before cutting, roughly 2 inches above the hem for a patch pocket, and cut a separate facing for a welt.
What seam allowance does a vest need?
Five eighths of an inch on the seams, 1 inch at the hem, 1 1/2 inches at the centre back for future alteration, and three eighths of an inch around the neckline and armholes if the vest is lined. Write the figures on the pattern as you add them.
How long should a vest be?
The waist length is the most versatile: it finishes at the natural waist or an inch below it. A hip length vest finishes 4 to 6 inches lower and needs the hip measurement added to the draft, because the waist shaping alone will pull across the seat.
Conclusion
A vest pattern is two panels and six numbers, and the part that decides whether it works is not the drawing but the order: measurements first, ease second, panels third, and the three matching checks before anything gets cut. Draft the back from the centre back line, draft the front from the centre front line, and let the shoulder seam and the side seam arbitrate between them.
In Mithu’s experience drafting vests for people who have never made a pattern before, the ones that fit are the ones where the toile was sewn and pinched at the underarm before the good fabric came out. Paper is a proposal. Calico is the first real answer.
Start with one shoulder of the toile pinned and the armhole checked against a raised arm, then adjust the paper by half an inch rather than starting again. The guide to adding boning to a bodice is the next step if the vest will be worn structured, and the hood pattern draft is a useful second exercise in reading your own draft points.
What will your first vest be made in?
About This Guide
This guide was tested by Mithu, who drafted vest panels for a 38 inch bust on kraft paper, sewed three calico toiles with 5/8 inch seams, and compared the draft against a bodice block and a darted sloper before cutting wool suiting.
All images in this article were created using AI.