How to Sew Stretch Fabric Without Puckering or Popped Seams

The short answer: to sew stretch fabric on a regular sewing machine, use a ballpoint or stretch needle, all-purpose polyester thread and a stretch stitch such as a narrow zigzag (about 1 to 1.5 mm wide and 2.5 mm long) or your machine’s lightning-bolt stretch stitch. Don’t pull the fabric while you sew; let the machine feed it. A straight stitch will snap the first time the seam stretches.

Stretch fabric is one of the biggest fears our students bring to class, and it doesn’t need to be. Once you know these few rules, knits become some of the most comfortable and forgiving garments to make.

What counts as stretch fabric?

• Jersey: a light, soft knit used for T-shirts, dresses and skirts.
• Rib knit: a stretchy knit with visible lines, often used for neckbands and cuffs.
• Interlock and ponte: thicker, more stable knits that are easier for beginners.
• Spandex, Lycra and elastane blends: very stretchy fabrics used for swimwear, activewear, bodysuits and leggings.

If you’re new to knits, start with a stable ponte or interlock before moving to light jersey or swimwear fabric.

Which needle should you use for stretch fabric?

Use a ballpoint or jersey needle (size 75/11 or 80/12) for cotton knits and jersey. Use a stretch needle (75/11 or 90/14) for fabrics with a lot of spandex or elastane, such as swimwear and leggings. A sharp universal needle can cut the knit’s loops, causing holes, runs and skipped stitches. Our needle guide explains the differences.

Which stitch should you use for stretch fabric?

• Narrow zigzag: width around 1 to 1.5 mm, length 2.5 mm. It looks almost straight but stretches with the fabric.
• Lightning-bolt or stretch stitch: found on many modern machines, designed for knit seams.
• Triple stretch stitch: very strong; good for activewear seams, but hard to unpick.
• Twin needle: two parallel rows of stitching for professional-looking hems on T-shirts and dresses.

A serger (overlocker) sews, trims and finishes stretch seams in one step, but it’s optional. You can make beautiful knit garments on a regular machine.

Which thread should you use?

All-purpose polyester thread is the best choice. It has a little give and is stronger than cotton thread, which can snap when a knit seam stretches. For very stretchy swimwear seams, some sewists use woolly nylon thread in the bobbin for extra stretch.

Why are my stretch seams wavy?

Wavy, rippled seams happen when the fabric stretches as it feeds through the machine. To fix it:

• Don’t pull or push the fabric. Rest your hands lightly and let the feed dogs do the work.
• Reduce the presser foot pressure if your machine allows it.
• Use a walking foot, which feeds the top and bottom layers evenly.
• Lengthen your stitch slightly.
• Press the seam with steam afterwards; many ripples relax with pressing.

How should you cut and pin stretch fabric?

• Pre-wash your fabric first; many knits shrink.
• Lay the fabric flat on a table so no part hangs over the edge and stretches.
• Find the direction of greatest stretch and follow your pattern’s grain and stretch markings.
• Use sharp scissors or a rotary cutter, and pin within the seam allowance or use clips to avoid holes.

Which projects are good for practising?

A simple pull-on skirt with an elastic waist, a T-shirt with a ponte or interlock body, or a basic bodysuit are excellent first knit projects. Swimwear is a natural next step once you’re comfortable.

Frequently asked questions

Can you sew stretch fabric with a regular sewing machine?

Yes. Use a ballpoint or stretch needle, polyester thread and a narrow zigzag or stretch stitch. A serger is helpful but not required.

What stitch is best for stretch fabric?

A narrow zigzag (about 1 to 1.5 mm wide, 2.5 mm long) or your machine’s lightning-bolt stretch stitch. Avoid straight stitch on seams that need to stretch.

Why do my stretch fabric seams pop?

A straight stitch can’t stretch with the fabric, so it snaps. Switch to a zigzag or stretch stitch and use polyester thread.

How do I stop stretch fabric from puckering or rippling?

Don’t pull the fabric as you sew, use a walking foot or lower presser foot pressure, lengthen the stitch slightly and press the seam with steam.

What needle should I use for spandex or swimwear?

Use a stretch needle in size 75/11 or 90/14.

Learn it hands-on in Trinidad

Stretch fabrics click faster when someone shows you in person. Start with our Beginner Sewing Bootcamp, TTD 1,500 for three sessions with machines provided. When you’re ready for stretch, our once-a-year Swimwear Sewing Intensive and our bodysuit masterclass build on these exact skills. Browse all Taylor M Academy classes to see what’s open now.