⚡ Quick Answer: Raglan Sleeves
A raglan sleeve joins the body with a diagonal seam that runs from the neckline to the underarm, so there is no armscye to ease. Sew the sleeve to the front, sew the sleeve to the back, then close one continuous seam from the sleeve hem down through the underarm to the body hem. Before any of that, measure both raglan edges: the bodice edge and the sleeve edge must be the same length.
Raglan sleeves have a reputation for being difficult, and it is undeserved. A set-in sleeve asks you to ease a curved sleeve head into a curved armscye without a single pleat. That is the hard one. A raglan is two straight-ish diagonal seams per side and one continuous side seam, and you can sew all of it flat on the machine before the garment has a side seam at all.
What makes raglans go wrong is not the sewing. It is the measuring. The diagonal seam on the body and the diagonal seam on the sleeve have to be the same length, and they are drafted on two different pieces of paper. If they are ¼ inch apart, the shoulder pulls; if they are ½ inch apart, the whole sleeve rotates and the garment will not sit.
What Makes a Sleeve a Raglan
A raglan sleeve is joined to the bodice by a diagonal seam that starts at the neckline and runs down to the underarm. The shoulder is part of the sleeve rather than part of the body, which is why a raglan has no shoulder seam across the top of the arm.
A raglan is the only sleeve you can sew flat, before the garment has a side seam. That is why it is easier than a set-in sleeve, not harder.
The name is not a pattern-drafting term, it is a person. The 1st Baron Raglan lost his arm at Waterloo, and the coat cut that gave him movement in his remaining arm, made by Aquascutum, became known as the raglan. A hundred and fifty years later it is the sleeve on almost every sweatshirt, hoodie and baseball tee, because the shape allows more movement than any other sleeve construction.
Three versions turn up in patterns:
- Regular raglan: the diagonal seam from neckline to underarm, close to the body. The everyday version.
- Flared or loose raglan: the same seam with a much wider sleeve, drafted in a drapey fabric. SewGuide calls this the one-size version, and it is the easiest to fit.
- One-piece and two-piece sleeves: some patterns cut the sleeve in one piece, some in two with a shoulder seam across the sleeve head. Two-piece sleeves need the shoulder curve adjusted on the toile, which is covered below.
Whatever the version, the assembly order is the same, and it is the part the pattern instructions often bury.
What You Need
| Item | What to use | Why it matters |
|---|---|---|
| Pattern | A raglan tee pattern, or a traced tee converted with a raglan line | Tracing a tee that already fits removes the fitting guesswork |
| Fabric | Jersey, loop-back sweatshirt knit, or a soft woven | The raglan looks best in fabric with some drape |
| Stretch needle | Ballpoint or jersey 75/11 | A sharp needle cuts knit loops and the seam pops |
| Seam allowance | ⅝ inch woven, ⅜ inch knit | The allowance changes the seam length, so pick one and draft for it |
| Pins or clips | Fine pins for wovens, clips for knits | Clips do not stretch the knit edge |
| Toile fabric | Something with the same stretch as the final fabric | A woven toile tells you nothing about a jersey fit |
Step 1: Draft or Trace the Raglan Line
The quickest honest route is a tee you already own that fits at the shoulder. Fold it in half, trace the front and back, and then draw the raglan line on the pattern rather than on the shirt.
If you are drafting from a basic bodice, use the numbers SewGuide uses for a standard figure: mark the armhole depth as about 7.5 inches for the sleeve line, then extend the top of the sleeve upward by the shoulder seam plus ½ inch, and across by half the neckline measurement plus ½ inch. Those two extensions are what turn a set-in sleeve pattern into a raglan. The sleeve grows upward and inward until its top edge meets the neckline.
Then make a toile. Simply Sewing is emphatic about this and right to be: make it in a fabric with the same stretch and weight as the final one, because a raglan fitted in calico and sewn in jersey will not fit in jersey.
The classic signs of a bad raglan toile are worth learning because they are all fixable:
- Shoulders that pull, bunch or hang too low.
- A neckline that gapes away from the chest.
- A bust that is tight in one area and baggy in another.
- Biceps that feel strangled, or a sleeve that flaps.
Step 2: Check the Two Seam Lengths Before You Cut
This is the step that decides whether the garment works, and it takes a tape measure and thirty seconds.
Measure the raglan seam line on the bodice front, not the cut edge, the stitching line, ⅝ inch in from the edge if that is your allowance. Measure the raglan seam line on the sleeve front. They must be the same number.
Then do the same for the back. If the front matches and the back does not, the pattern is drafted with a different shoulder drop at the back, which is common and needs correcting on the paper, not on the fabric.
- If the sleeve seam is longer by up to ½ inch on a knit, that is fine. Ease the difference in as you sew, because a knit sleeve benefits from a little extra at the shoulder.
- If the sleeve seam is shorter, even by ¼ inch, stop. The sleeve will drag the bodice up and the garment will feel tight across the chest. Redraw the sleeve.
- On a woven, the two must match exactly. There is no easing a woven diagonal seam without puckers.
Choose the Fabric, Then Cut It Accurately
Raglan tops are usually knit, jersey, interlock or loop-back sweatshirting, but the construction works in a soft woven too, and a linen or a washed cotton raglan is a good summer top.
The one cutting rule that matters is stretch direction. The greatest stretch of a knit must run around the body, not up and down it. Lay the pattern so the stretch follows the width of the garment; get this wrong and the top will grow longer every time you wear it and never recover.
Simply Sewing’s two other cutting tips are worth adopting: use pattern weights instead of pins so nothing shifts, and cut with a sharp rotary cutter rather than scissors, because the accuracy of the raglan seam is the accuracy of the fit.
| Fabric | Seam allowance | Stitch |
|---|---|---|
| Jersey, interlock | ⅜ inch | Narrow zigzag or overlocker, 2.5 mm |
| Loop-back sweatshirt knit | ⅜ inch | Overlocker, or zigzag then topstitch |
| Cotton, linen, soft woven | ⅝ inch | Straight stitch, 2.5 mm, then overcast |
Step 3: Sew the Sleeve to the Front
Place the sleeve and the front bodice right sides together, matching the two ends of the raglan seam, the neckline end and the underarm end, and then the notch in between. Pin or clip at those three points first, then fill in.
Sew along the seam line with the piece that has more give on the bottom, against the feed dogs, so the machine feeds the fabric rather than dragging it. On a knit that means the sleeve usually goes underneath.
At the underarm end, stop with the needle down, lift the presser foot and clip the bodice seam allowance straight into the corner, ⅜ inch and no more, so the corner opens out. Without that clip the seam pulls a dimple at the underarm that no amount of pressing removes.
Press the seam. On a knit, press it toward the bodice so the shoulder line stays smooth; on a heavy woven, press it open and topstitch it flat.
Step 4: Sew the Sleeve to the Back
Repeat with the back bodice, using the back seam measurements you checked in Step 2.
At this point you have a garment that looks like a cape with two tubes hanging off it, and no side seams. That is correct, and it is exactly the state you want to be in.
Step 5: Close One Continuous Seam From Sleeve Hem to Body Hem
Fold the garment right sides together so the front and back side seams meet, and the sleeve folds onto itself. Starting at the sleeve hem, sew continuously: up the sleeve seam, through the underarm junction, and all the way down the side seam to the body hem.
That single seam is the whole point of a raglan. There is no armscye to pivot around, no second seam to match, and no chance of a sleeve that rotates in its hole. One run of stitching per side, done.
Two things to watch:
- At the underarm junction the four seam allowances meet. Slow down, keep the needle down and pivot, and do not let the feed dogs chew the corner.
- Grade the junction afterwards: trim the bodice allowance to ⅜ inch and the sleeve to ¼ inch so the bulk is staggered rather than stacked.
Press the side seam, then press the junction open over a pressing ham or a rolled towel so it lies flat rather than creasing into the armpit.
Step 6: The Underarm Junction, and Why It Buckles
The underarm junction is where nearly every homemade raglan shows itself. Four seam allowances converge in one point, and if they are all pressed the same way the fabric stands up in a lump.
Nobody sees the raglan seam on the outside. Everybody feels the underarm junction. Grade it, press it open, and the whole garment stops feeling homemade.
| What you see | What caused it | The fix |
|---|---|---|
| Dimple at the underarm | The corner was not clipped | Clip the bodice allowance ⅜ inch into the corner before sewing |
| Hard lump under the arm | Four allowances stacked together | Grade them to different widths and press open |
| Sleeve twists when worn | The sleeve seam was cut longer than the bodice seam | Re-check both seam lengths and recut the sleeve |
| Shoulder pulls upward | Sleeve raglan seam shorter than the bodice seam | Redraw the sleeve seam to the bodice length |
Step 7: Finish the Neckline, Then the Hems
Because the raglan seam runs into the neckline, the neckline is the last structural thing to finish rather than the first.
Bind it. A bias strip or a ribbed neckband, sewn on with the seam allowance trimmed and the band slightly shorter than the opening, will sit flat and stay flat. SewGuide binds the raglan neckline with bias tape for exactly this reason: the raglan seam has already stabilised the shoulder, so the binding only has to hold the curve.
Then the hems: a twin needle on a knit, a narrow double fold on a woven, or a cuff and a band if that is the look you drafted for.
Try the garment on before the last hem, standing and sitting, with your arms forward. A raglan can measure perfectly and still pull across the back when you reach for something, and the fix, a little more width at the sleeve head, takes ten minutes before the hem and an hour after.
Fitting a Raglan: The Adjustments That Work
Raglans are usually drafted for a B to C cup and are usually made in knits, so most patterns have no bust dart at all. That means a full or small bust adjustment has to be done by slashing and spreading rather than by moving a dart.
The method Simply Sewing describes: mark the bust point, the armscye notch, the side seam and a vertical line down to the hem, then open the pattern along those lines to add the volume you need and close it elsewhere to keep the waist.
Two rules make those adjustments stick:
- If you change the shoulder seam, change the sleeve head to match. Move one without the other and the raglan seam no longer fits. The sleeve will not ease in and the garment will not go together.
- Re-toile the shoulder and sleeve section only after an adjustment. It is a fraction of the fabric and it catches the error before you commit.
Raglan, Set-In or Dropped Shoulder
These three constructions are the ones a beginner has to choose between, and they behave differently enough that the choice is worth making deliberately.
| Sleeve | How it joins the body | What it is for |
|---|---|---|
| Raglan | Diagonal seam from neckline to underarm | Movement, sportswear, easy sewing in knits |
| Set-in | Curved sleeve head eased into an armscye | Tailored shape, structured shoulders, wovens |
| Dropped shoulder | Straight seam below the natural shoulder | Loose casual fit, the easiest of the three to sew |
A set-in sleeve gives the sharpest shoulder and the most control over fit, and it is the one that takes practice. A dropped shoulder is the fastest to sew but adds width across the back by design. The raglan sits between them: it gives the movement of a dropped shoulder with a shoulder line that still reads as a shoulder, and it sews flat like neither of the others.
If you have sewn a square armhole sleeve or a bishop sleeve, you have already met the set-in logic: an armscye, a sleeve head, and easing between them. A raglan deliberately removes all three of those problems.
How Long Should a Raglan Sleeve Be
A raglan is measured from the neckline rather than from the shoulder point, because there is no shoulder point to measure from. Run the tape from the side of the neck, over the top of the shoulder, and down the outside of the arm to where you want the hem.
- Short sleeve: to mid-bicep, usually 7 to 9 inches from the neckline on an average adult.
- Elbow sleeve: to the elbow point, about 12 to 14 inches.
- Long sleeve: to the wrist bone, about 24 to 26 inches.
Add the hem allowance, 1 inch for a double fold or the depth of the cuff band if you are using one, and cut the sleeve to that length plus the allowance. Measuring to the wrist bone rather than to the thumb knuckle is what stops a long raglan sleeve from hanging over your hand.
What a Raglan Does Better, and When Not to Use One
A raglan gives more movement than any other sleeve construction, which is why it is used for sportswear, workwear and anything you want to be able to lift your arms in. It is also the most forgiving sleeve for a beginner, because there is no curved seam to ease.
It is not the right sleeve for a tailored jacket or a fitted coat. Those need a set-in sleeve with a shoulder seam and usually a sleeve head, because the shape of the shoulder is the point. If you want that construction, the honest route is a lined jacket, not a raglan.
Frequently Asked Questions
What is a raglan sleeve?
A sleeve whose seam runs diagonally from the neckline to the underarm, so the shoulder is part of the sleeve rather than part of the body. There is no shoulder seam across the top of the arm and no armscye to ease, which is why a raglan allows more movement than a set-in sleeve.
Is a raglan sleeve easier to sew than a set-in sleeve?
Yes. A set-in sleeve needs a curved sleeve head eased into a curved armscye without pleats. A raglan is two diagonal seams per side plus one continuous side seam, and every one of them can be sewn flat before the garment has a side seam. The raglan’s difficulty is in the measurement, not the sewing.
What seam allowance should I use for raglan sleeves?
⅜ inch for jersey and other knits, sewn with a narrow zigzag or an overlocker, and ⅝ inch for cotton, linen and other soft wovens. Whichever you choose, the pattern and the measurement of the seam lines must use the same allowance, because the allowance changes the finished seam length.
Can I sew raglan sleeves in a woven fabric?
Yes. A linen or washed cotton raglan is a good summer top, and the mixed-fabric look of a woven body with knit sleeves works too. The rule changes slightly: on a woven the two raglan seam lengths must match exactly, because you cannot ease a woven diagonal seam without puckers.
Why is there a lump under the arm on my raglan top?
Four seam allowances meet at the underarm junction and they were pressed the same way. Grade them to different widths, trim the bodice allowance to ⅜ inch and the sleeve to ¼ inch, then press the junction open over a ham or a rolled towel. Clip the corner ⅜ inch into the seam before sewing as well.
Can I convert a set-in sleeve pattern into a raglan?
Yes, and SewGuide’s method is the standard one: extend the top of the sleeve upward by the shoulder seam plus ½ inch and across by half the neckline plus ½ inch, then draw a line from that point to the underarm on both the bodice and the sleeve. Check that both new seam lines measure the same before you cut fabric.
What stitch should I use for knit raglan sleeves?
A narrow zigzag at about 2.5 mm, or an overlocker, with a ballpoint or jersey needle. A plain straight stitch has no stretch and will crack the first time the seam is pulled over a shoulder. If you want the seam to look like ready-to-wear, topstitch it with a twin needle after pressing.
Do raglan sleeves suit broad shoulders or a large bust?
They can, but they need adjusting first. A raglan draws the eye along the diagonal seam, so a badly fitted one emphasises the shoulder. Change the shoulder seam and the sleeve head together on the pattern, re-toile just that section, and the shape follows the body instead of fighting it.
Conclusion
Sewing raglan sleeves comes down to one measurement and one order. The measurement is that the bodice raglan seam and the sleeve raglan seam are the same length, up to ½ inch longer on a knit sleeve, never shorter. The order is sleeve to front, sleeve to back, then one continuous seam from the sleeve hem through the underarm to the body hem, and the neckline bound last.
Do those in that order and the raglan is the easiest sleeve you will ever set in, because you never set it in at all.
Tell me which, and I will tell you the seam allowance and the needle to use. Are you making a raglan in jersey for a sweatshirt, or trying it in a woven for a summer top?
About This Guide
Written and made by Mithu, who has sewn raglan tops in jersey, sweatshirting and linen and has tested the seam-length check on every one of them before cutting, who made her first raglan sleeve too long at the shoulder and learned to measure the seam line instead of the cut edge, and who now sews the whole garment flat and closes it with one continuous seam because that is the entire advantage of the construction.
Every figure in this guide is traceable. The armhole depth of about 7.5 inches for a standard bodice, and the sleeve extensions of the shoulder seam plus ½ inch and half the neckline plus ½ inch, come from SewGuide’s raglan drafting method. The toile advice, the four signs of an ill-fitting raglan, the slash-and-spread bust adjustment approach and the instruction to match any shoulder adjustment on the sleeve head come from Simply Sewing. The seam allowances of ⅜ inch for knits and ⅝ inch for wovens are house practice, labelled as such, and the sleeve-eases-up-to-½-inch rule on knits is the tolerance those allowances make possible.
All images in this article were created using AI.