How to Sew Stretch Fabric by Hand
You can sew stretch fabric by hand, and the seams will hold if you use stitches that can move with the fabric. Use a backstitch for seams that join two pieces, and a herringbone (catch) stitch for hems, necklines and cuffs. Sew with polyester thread, use a ballpoint hand needle if you have one, and keep every stitch snug but never tight. A plain running stitch, the stitch most people reach for first, will snap the first time the fabric stretches.
Everything below is for sewing with a needle in your hand. You’ll find what to use, how to work both stitches, and fixes for the problems knits tend to cause.
Why Stretch Fabric Breaks Ordinary Hand Stitches
Knits and spandex blends stretch every time you move. A straight running stitch lays thread in a flat line that has no slack in it, so when the fabric stretches the thread has nowhere to go. It either pulls the seam into puckers or breaks.
A stitch that stretches has to store extra thread in the seam. Stitches that double back on themselves (backstitch) or cross over each other (herringbone) do this: when the fabric pulls, the thread straightens out instead of snapping. Any hand stitch formed with a back-and-forth or criss-cross motion will give some stretch; a straight line will not.
What You Need
- A ballpoint hand-sewing needle, if you can get one. The rounded tip slides between the knit loops instead of piercing them, which helps prevent small holes and runs. On a stable knit a fine regular needle works too. Test on a scrap first. Choose a finer needle for thin jersey and a sturdier one for fleece or ponte.
- All-purpose polyester thread. It’s strong and has a little give. Cotton thread is fine for woven fabric but tends to break in seams that stretch. For a stronger, hand-only seam, many hand-sewers of jersey use button-and-craft thread, often doubled.
- Pins or clips. Place pins inside the seam allowance only, because some knits show pin holes. Clips work well on thick knits.
- Beeswax or thread conditioner, if you have it. Running the thread through it once reduces tangling and knots, which matters with doubled thread.
- Scraps of the fabric you’re sewing. Every knit behaves a little differently, so practise each stitch on a scrap and stretch it hard before you sew the real thing.
Cut your thread no longer than your arm from fingertip to elbow. Longer lengths twist and knot, and the friction of pulling a long strand through knit wears the thread.
The Backstitch: Your Main Seam Stitch
The backstitch is the strongest hand stitch and the right choice for seams that join pieces, such as side seams, sleeve seams or a split seam you are repairing. On the right side it looks like a continuous line; on the back the stitches overlap, and that overlap is what lets the seam give a little.
- Place the two pieces right sides together and pin within the seam allowance. Mark your seam line with chalk or a washable marker if you need a guide.
- Knot the end of the thread and bring the needle up through both layers one stitch length in from the end of the seam line.
- Insert the needle back down at the very start of the seam line, one stitch length behind where the thread came out.
- Bring the needle up again one stitch length ahead of where the thread first came out.
- Go back down into the end of the previous stitch, so each new stitch touches the last one. Repeat along the seam.
- Keep stitches small and even. Roughly the length of a grain of rice is a good starting point on medium jersey.
- At the end, take two small stitches on top of each other in the seam allowance and knot off.
The key to stretch: pull each stitch only until the thread lies flat against the fabric. If the fabric starts to gather, you are pulling too hard. When you finish, stretch the seam gently; it should lengthen with the fabric without any popping sound.
The Herringbone (Catch) Stitch for Hems, Necklines and Cuffs
Hems, necklines, cuffs and waistbands stretch more than side seams because they have to go over your head, hands and hips. The herringbone stitch, also called the catch stitch, is the stitch for these. Its criss-cross shape stores plenty of thread, so it stretches well, and on a hem only tiny dots show on the outside.
To hem a knit with herringbone stitch:
- Fold the hem up to the wrong side and pin it. Knits don’t fray, so you can leave the raw edge unturned, which keeps the hem flat and flexible.
- Work from left to right (right to left if you are left-handed), with the needle pointing in the opposite direction to the way you’re travelling.
- Knot the thread and bring the needle up through the folded hem allowance, just below its raw edge.
- Move a little to the right and take a tiny horizontal stitch in the garment just above the hem edge, catching only a thread or two so it barely shows on the outside.
- Move a little to the right again and take a tiny horizontal stitch in the hem allowance.
- Keep alternating between the garment and the hem allowance. The thread forms a row of small Xs.
- Leave the stitches slightly relaxed. Herringbone only stretches if the crosses have room to open up.
The same stitch works for attaching a neckband or facing on the inside, and for tacking elastic casings.
Also Read:
Finishing Raw Edges by Hand
Most knits don’t fray, so you often don’t need to finish the seam allowance at all. Where you want a neater edge, or the fabric curls, use one of these:
- Overcast (whipstitch): loop the thread over the raw edge at even intervals. Keep the loops loose so the edge can still stretch.
- Blanket stitch: a little slower, but it gives a neat, slightly decorative edge that sits flat and has some give.
Avoid turning a narrow double hem on a lightweight knit by hand. The extra layers make the edge stiff and wavy.
How to Sew a Stretch Seam by Hand: Step-by-Step
- Prewash the fabric the way you’ll wash the finished piece, especially cotton jersey, which can shrink.
- Test first: sew a few centimetres of backstitch and of herringbone on a scrap, then stretch them as far as the garment will need to stretch. Adjust stitch size and tension until neither stitch breaks.
- Pin within the seam allowance, matching the edges without pulling the fabric. If one layer is longer than the other, ease it in gradually rather than stretching the shorter one.
- Sew with the fabric resting flat on a table or your lap, not held up in the air where gravity stretches it.
- Use backstitch for joining seams and herringbone for hems, keeping the thread snug, not tight.
- Stretch-test as you go: every 10 cm or so, gently pull the seam. It’s much easier to fix tension early than to unpick a finished seam.
- Press gently, if at all, with low heat and a pressing cloth. Many synthetic knits can be damaged by a hot iron.
Common Problems and How to Fix Them
| Problem | Likely cause | Fix |
|---|---|---|
| Stitches pop when the seam is stretched | Running stitch used, or thread pulled too tight | Switch to backstitch or herringbone; leave stitches slightly relaxed |
| Seam looks wavy or rippled | Fabric was stretched while sewing | Sew with fabric lying flat; don’t pull it through the needle |
| Small holes or runs along the seam | Sharp needle piercing the knit loops | Use a ballpoint hand needle, or a finer needle |
| Thread keeps tangling | Thread too long or very twisty | Shorter lengths; run thread through beeswax |
| Hem puckers on the outside | Catching too much fabric on the garment side | Pick up only one or two threads per stitch |
| Edges curl while you work | Normal for single jersey | Pin more often, or fold the edge before sewing |
When a Sewing Machine Is the Better Choice
Hand sewing is ideal for repairs, small projects, hems, attaching trims, and garments you want to make slowly and carefully. You can make whole jersey garments by hand, and some designers build entire collections that way, but expect it to take time.
For activewear, swimwear, leggings and other pieces that stretch hard and get washed often, a machine stretch stitch or a serger will usually give a more durable result faster. Many people combine both: machine the long seams and hand-finish the hems with herringbone stitch.
Frequently Asked Questions
Can you sew stretch fabric by hand without a sewing machine?
Yes. Use backstitch for seams and herringbone (catch) stitch for hems, with polyester thread and a ballpoint hand needle. Keep stitches snug rather than tight, and test on a scrap first.
What is the best hand stitch for stretchy fabric?
For seams, the backstitch. For hems, necklines and cuffs, the herringbone (catch) stitch, because its criss-cross structure stretches the most.
Why do my hand stitches keep breaking on knit fabric?
Usually because a running stitch was used or the thread was pulled tight. Both leave the thread no slack, so it snaps when the fabric stretches. Switch stitches and loosen your tension slightly.
Do I need special thread to hand sew stretch fabric?
All-purpose polyester thread works well. For extra strength, use button-and-craft thread, often doubled, which is what many hand-sewn jersey projects use.
References
- Wikipedia contributors. “Backstitch.” Wikipedia, The Free Encyclopedia. https://en.wikipedia.org/wiki/Backstitch
- Wikipedia contributors. “Herringbone stitch.” Wikipedia, The Free Encyclopedia. https://en.wikipedia.org/wiki/Herringbone_stitch
- Chanin, N. (2012). Alabama Studio Sewing + Design: A Guide to Hand-Sewing an Alabama Chanin Wardrobe. STC Craft / Melanie Falick Books.
- Bury, T. Hand Sew a Knit Garment (instruction guide). Kinship Handwork. https://kinshiphandwork.com/wp-content/uploads/2020/07/Hand-Sewing-Instructions.pdf
