⚡ Quick Answer: How Do You Hand Sew?
Cut a thread about 18 to 24 inches long, which is fingertip to elbow, thread a sharps needle in size 7 or 8, and knot one end. Anchor the thread by taking two small stitches in the same spot so the knot has something to sit against, then work your stitch at an even 2 to 3 mm and keep the tension snug without pulling the fabric into puckers. Finish with two or three backstitches in place, not a bare knot.
You need five stitches to handle almost everything: running stitch for seams and gathering, backstitch for anything that takes strain, slip stitch for hems you do not want to see, whip stitch for joining edges, and blanket stitch for finishing a raw edge. A sixth, the catch stitch, is the one for stretchy fabric, because it zigzags and moves with the cloth instead of fighting it.
What follows is the setup, all six stitches with their stitch lengths, and the four faults that make hand sewing look homemade. Most of the difference between a seam that holds and one that gapes is not talent, it is thread length and tension.
Step 1: Set Up the Needle and Thread Correctly
Cut the thread to 18 or 24 inches, no longer. This single habit prevents more tangling than any technique. A long thread rubs against itself on every pass through the fabric, and by the twentieth stitch it has frayed spots and a twist that turns into a knot. Fingertip to elbow is the traditional measure and it is the right one. If you are working a long seam, cut a fresh length when you run out rather than trying to stretch the last few inches, because the joins are where a seam looks weakest.
For needles, a sharps in size 7 or 8 covers most woven fabric, which is why an assorted pack is the practical first buy. Sizes 5 to 9 handle everyday sewing, with a lower number meaning a thicker needle. Go to a size 3 or 4 for denim and canvas, a size 10 to 12 for fine silk and lawn, and switch to a ballpoint for knits so the point slides between the fibres instead of piercing them. Betweens are shorter with a small eye and are the choice for fine, precise work where a long needle wobbles.
Thread weight matters less than people expect, but it does matter. All-purpose thread in 40 to 50 weight suits most garments. Use 30 weight or heavier on coats and denim, and finer thread on silk to avoid puckering. Run the thread across beeswax twice before you thread the needle and friction drops sharply, which is the difference between a thread that glides and one that knots every dozen stitches. Match the thread to the fibre as well as the weight: polyester thread on a cotton shirt is fine, but cotton thread on a stretch knit will break before the fabric does.
Step 2: Anchor the Thread Before the First Stitch
Bring the needle up from the wrong side about half an inch from where your stitching line starts, take two small stitches across that spot, and end on the side you plan to work from. Those two stitches are the anchor. They spread the load over a few threads of the weave instead of one hole, which is what stops the end working loose later.
Tailors use a waste knot for the same job: knot the thread, take the first stitch an inch away from the seam line, work several stitches holding the knot taut, then cut the knot off close to the fabric. The thread is anchored by the stitching rather than by a lump, which matters on fine fabric where a knot can show through.
Leave three or four inches of thread when you judge the end of a seam. Running out with two inches left is how people end up with a loose thread and a gap, because there is not enough left to make the finishing stitches.
Step 3: The Running Stitch
Bring the needle up at the start of your line, then weave the point in and out of the fabric two or three times before pulling the thread through. Loading several stitches onto the needle at once is what gives you an even line: the spacing is set by how you load the needle, not by how fast you pull.
Aim for stitches and gaps of 2 to 3 mm on light fabric and up to 6 mm on heavy fabric. Too short a stitch weakens the cloth along the line, because every stitch is a hole. Too long and the seam gapes when the fabric is pulled. The quickest self check is to look at the line from a distance: it should read as a single dashed line with a steady rhythm. If it reads as a series of uneven dashes, the loading was uneven rather than the pulling.
The running stitch is the one to learn first and it is also the one that does the most jobs. It sews a seam on light fabric, it gathers by running a long stitch and pulling the thread, it bastes a fold before machine sewing, and it quilts. What it does not do well is take strain, which is the next stitch.
Step 4: The Backstitch, Which Is the One That Holds
Bring the needle up one stitch length ahead of where you want to begin, then push it back down at the end of the previous stitch. The needle travels forward underneath by twice the length of the visible stitch, which is what fills the gap and creates an unbroken line. Repeat, and keep the visible stitches around 3 mm.
This is the strongest seam you can make by hand and the only one that genuinely compares with a machine, because the stitches interlock rather than sitting in a row. Use it for crotch seams, armholes, anything that takes load, and any repair where you do not want to do the job twice. It is slower than a running stitch by design: each stitch is one complete pass. On a repair that will be washed often, that extra time is the whole difference, because a backstitched repair fails at the fabric before it fails at the thread.
Right handed stitchers work right to left, left handed stitchers left to right, so that the needle is travelling forward into the open fabric rather than into the work already done. If your backstitch line drifts or the fabric gathers, the cause is almost always tension, not the direction.
Step 5: Slip Stitch and Ladder Stitch for Invisible Seams
Press the fold crisp first, because the slip stitch cannot straighten a wavy edge that the iron should have fixed. Bring the needle up through the inside of the fold so the knot is buried, take a stitch into the garment directly opposite, catching only one or two threads of the fabric, then slip the needle back into the fold and travel along it about 6 mm before bringing it out again.
Work from right to left and keep the stitches about 6 mm apart. The aim is a seam that holds while showing nothing. Three faults account for almost every bad slip stitch: catching too much garment fabric, so the stitches pull through to the right side; spacing stitches too far apart, so the hem droops between them; and pulling the thread tight, so the hem line puckers. All three are visible from the outside, which is why the slip stitch is the least forgiving of the six.
The ladder stitch is the same movement used to close an opening rather than to hold a hem, worked across a gap between two folded edges with the thread crossing the gap in short rungs. Use it for turning openings on cushions, soft toys and anything stuffed, where you want the closure to disappear.
Step 6: Whip Stitch and Blanket Stitch
The whip stitch joins two edges by passing the needle over them at a slight angle, catching a few threads on each pass. It is fast, and it is the right stitch for closing a seam that will not be seen, joining two folded edges, or tacking an applique down before you sew it properly. Keep the stitches small and even, and do not pull each one tight: a whipped seam should sit flat, not gather.
The blanket stitch is different in purpose. It takes a stitch through the fabric and then loops the thread around the edge before pulling, so the thread wraps the raw edge and stops it fraying. Space the stitches evenly, catch a consistent depth of fabric, and keep the loop tension the same on every stitch or the border will wander. It is the standard finish on felt, fleece, applique edges and any woollen that would fray apart without it.
Both stitches are on show, unlike the slip stitch, so thread colour matters. Matching thread makes a whip stitch nearly invisible at arm’s length. A contrast thread turns blanket stitch into a decorative border, which is a legitimate design choice and one of the reasons hand sewing still gets used on visible work rather than hidden inside it.
Step 7: The Catch Stitch for Stretchy Fabric
The catch stitch, sometimes called herringbone stitch, works from left to right with the needle pointing back towards your starting point. Take a small bite of the hem allowance, then a small bite of the garment a few millimetres to the right, keeping the thread crossing loosely between them so the stitches form a flexible zigzag on the inside.
The point is give. Knitted fabric and anything with stretch will pull a straight hem stitch until the thread snaps or the fabric distorts around it. The crossed, loose stitches of a catch stitch let the two layers move against each other without strain, which is why it is the standard finish on knit hems, sweater cuffs and stretch trousers.
Keep the stitches small and the thread slack, catching only a thread or two of the outer fabric so nothing shows on the right side. If the hem pulls in after you finish, the thread was too tight. Catch stitch is meant to lie on the surface, not grip it.
Step 8: Finish So the Work Cannot Unravel
Finish with two or three backstitches taken in the same spot on the wrong side. Those stitches lock the thread far more reliably than a knot tied in the air, because the friction is spread across several stitches rather than concentrated at one point. Then run the needle under a few existing stitches and trim the tail, so the end is buried rather than left to fray.
Leave about 3 mm of tail. Trim it flush and it unravels; leave it long and it catches on everything. Between those two is a short end tucked under the work, which is what you want.
Never finish with a knot on the right side, and never carry a long thread across the wrong side to start the next section. Both look tidy for a week and then become the thing that catches, pulls, and shows through the front of the garment after a wash.
Tension: The Fault Behind Almost Every Bad Seam
Gaps, puckers, drifting lines and stitches that pull through the fabric all come back to tension. The rule is snug, not taut: the thread should lie against the fabric without lifting it. If the cloth dimples under each stitch as you pull, you are pulling too hard, and unpicking will not fully undo it because the fabric has already been stretched along the stitch line.
Two habits prevent nearly all of it. Let the needle hang free every few stitches so the thread untwists, which is what causes the small loops that catch. And test on a scrap of the same fabric before you start on the garment, because the tension that is right for poplin is wrong for jersey.
Hand sewing still earns its place next to a machine for three jobs: anything needing control in a tight space, such as setting in a sleeve or closing a lining; anything where the seam has to disappear, which is a slip stitch and nothing else does it as well; and work you want to do away from a table. A machine is faster on a long straight seam, but it cannot hide a stitch inside a fold. The machine wins on speed, the needle wins on control.
Stitch Length by Stitch
The numbers worth pinning up beside the machine: stitch length by stitch, and the four faults you are most likely to meet, in the order they usually appear.
Stitch length is judged against the fabric, not the ruler. The same 3 mm stitch is right on poplin, too short on canvas and too long on silk. Test on a scrap, then match what looks even.
| Stitch | Stitch length | What it is for |
|---|---|---|
| Running | 2 to 6 mm, even | Seams on light fabric, gathering, basting, quilting |
| Backstitch | About 3 mm | Any seam or repair that takes strain, the strongest by hand |
| Slip or ladder | 6 mm apart | Invisible hems and closing openings in stuffed work |
| Whip | Small and even | Joining two edges where the seam will not be seen |
| Blanket | Even depth and spacing | Wrapping a raw edge so it cannot fray |
| Catch | Small, thread slack | Hems on knit and stretch fabric that must give |
| What you see | What caused it | What to do |
|---|---|---|
| Fabric puckered along the seam | Thread pulled taut instead of snug | Unpick and resew, letting the thread lie flat |
| Seam gapes when pulled | Stitches too long, or a running stitch where a backstitch was needed | Resew shorter, or change to backstitch |
| Stitches show on the right side | Too much fabric caught in a slip stitch | Resew catching one or two threads only |
| Knot pulls through the fabric | No anchor stitches, or a single knot on loose weave | Anchor with two small stitches before you start |
The slip stitch is the one place where light tension beats firm tension. You are hiding the thread, not cinching the fabric, so the thread should lie flat with the hem relaxed and unpuckered. If the hem line ripples after you finish, the tension was too tight, not the spacing.
Frequently Asked Questions
How long should the thread be when hand sewing?
Between 18 and 24 inches, which is roughly fingertip to elbow. A longer thread tangles and frays against itself before you finish the seam. Cut a fresh length for each section rather than trying to work with one long thread all the way through.
What is the strongest hand sewing stitch?
The backstitch. Each stitch overlaps the one before and the thread doubles back underneath, so the stitches interlock instead of sitting in a row. It is the only hand stitch that comes close to machine seam strength, and it is the right choice for crotch seams, armholes and repairs that take load.
Which hand sewing needle should a beginner buy?
A sharps in size 7 or 8 for general woven fabric, or an assorted pack of sharps so you have sizes for heavier and finer cloth. A lower number is a thicker needle. Use a ballpoint on knits, and a size 3 or 4 on denim and canvas.
How do I stop the thread knotting while I sew?
Cut the thread to 24 inches or less, run it across beeswax before threading, and let the needle hang free every few stitches so the thread untwists. Most knots are a twist that has built up, not a bad knot in the first place.
Do I need to knot the thread to start a seam?
A knot works on most fabrics, but two small stitches taken in the same spot anchor the thread better because the load is spread across a few threads of the weave. On fine fabric use a waste knot instead, and cut it away once several stitches are holding the thread.
How do I hand sew a hem so the stitches do not show?
Use a slip stitch. Press the fold first, bring the needle up inside the fold so the knot is buried, catch only one or two threads of the garment, then travel inside the fold about 6 mm before the next bite. Keep the tension light, because a tight slip stitch puckers the hem.
What stitch should I use for stretchy fabric?
The catch stitch, worked as a loose zigzag on the inside so the two layers can move against each other. A straight hem stitch on knit fabric will snap or distort the hem the first time it stretches.
How far apart should hand stitches be?
About 2 to 3 mm on light fabric and up to 6 mm on heavy fabric for a running stitch, roughly 3 mm for a backstitch, and 6 mm apart for slip stitches. Smaller is not always better: every stitch is a hole, and very short stitches can weaken the fabric along the line.
How do I finish a hand sewn seam so it does not unravel?
Take two or three backstitches in the same spot on the wrong side, then run the needle under a few existing stitches and trim the tail to about 3 mm. That holds far better than a knot tied in the air, which works loose in the wash.
Can you hand sew denim?
Yes, with a size 3 or 4 sharps and a strong polyester thread, or a single strand of upholstery thread. Press the seams flat first, use short backstitches, and push the needle through by gripping it with a thimble rather than forcing it with your fingertips.
Why does my hand sewing look uneven?
Almost always inconsistent stitch length caused by loading too few stitches on the needle at once. Load two or three stitches before pulling the thread through, and the spacing is set by the needle rather than by your pull. Tension is the second cause.
Is hand sewing as strong as machine sewing?
A backstitch seam is close, and on a repair it is often stronger than a machine seam because you can control where every stitch lands. A running stitch is much weaker and is for seams that take no strain. For long straight seams on a machine, the machine wins on speed rather than strength.
Conclusion
Hand sewing comes down to a short thread, a needle matched to the fabric, an anchor before the first stitch, and tension that lies flat instead of pulling tight. Learn the running stitch and the backstitch and you can repair most of what breaks. Add the slip stitch and you can make a hem disappear.
The rest is practice on scraps, which is cheap and fast and teaches the one thing no guide can: how firm snug feels in your own hands. Ten minutes on a scrap will teach you more about tension than an hour of reading about it, and the scrap is where a mistake costs nothing. If you want to take it further, hand sewn seams goes deeper on the backstitch, and sewing a button on by hand is the same anchor and tension method applied to a smaller job. For repairs, sewing on a patch uses the whip stitch in practice.
So which stitch is holding you back: the seam that will not stay even, or the hem you can still see?
About This Guide
This guide was written by Mithu, who has run the Craftsing studio for fifteen years and taught hand sewing to beginners who had never threaded a needle. She tested each stitch at three thread tensions on poplin, jersey and a heavy canvas, and the four faults in the table are the ones that came up on her own bench.
Stitch lengths and needle sizes were checked against published sewing references and against ready to wear construction. Where those sources give a range, this guide gives the range rather than picking a single number, because the fabric decides.
All images in this article were created using AI.