How to Hem Stretch Fabric?

Use a ballpoint or stretch needle with a zigzag, double needle, blind hem, folded band, or cover-stitch technique to hem stretch fabric without puckering or popped stitches. Knit fabrics — including jersey, interlock, and rib knits — stretch 15–25% crosswise, so the hem must move with the fabric rather than restrict it.

This guide covers five professional hemming methods using a standard sewing machine or serger. Each technique includes specific stitch settings, needle recommendations, and step-by-step instructions to help you achieve a durable, invisible hem on any stretch fabric project.

How to Hem Stretch Fabric

Select the Correct Needle and Thread

Needle selection is the single most impactful decision when hemming stretch fabric. A ballpoint needle (size 75/11 for lightweight knits; 90/14 for heavyweight knits) pushes fabric fibers apart rather than piercing them, which prevents snags and runs in jersey and interlock knits.

Polyester thread is the preferred choice because it stretches 12–18% before breaking — matching the fabric’s elasticity — whereas cotton thread snaps under tension. Use a size 75/11 ballpoint or stretch needle for fabrics with 15–25% crosswise stretch, and a size 90/14 ballpoint for heavyweight knits such as ponte and scuba.

Check the Pattern for Seam Allowances

After selecting the needle and thread, examine the pattern and measure seam allowances. Standard knit patterns include 1–3 inches (2.5–7.6 cm) of hem allowance beyond the finished hem line.

Fabrics with 20–25% stretch require the full 3-inch allowance to accommodate the fabric’s recovery. Low-stretch knits (10–15%) perform well with 1.5–2 inches of allowance. Insufficient allowance causes the hem to pull flat and lose its elasticity after wearing.

Choose the Right Hemming Technique

Five techniques produce professional results on stretch fabric: zigzag stitch, double needle, zigzag blind hem, separate folded band, and cover-stitch. Each method has a specific stitch setting range and is suited to different fabric weights and project types.

The zigzag stitch is the most accessible technique for beginners and produces reliable results on fabrics with 15–25% stretch. Set the machine to a narrow zigzag (width: 2.5–4 mm; length: 2.0–3.0 mm) and sew at 800–1000 stitches per minute for consistent penetration without fabric distortion.

Apply Hemming Tape for Stability

Hemming tape ( fusible web tape, 3/8–1/2 inch wide) stabilizes the hem before stitching, which reduces puckering by up to 80% on lightweight jersey. Place the tape on the wrong side of the fabric along the fold line, then apply heat at 250–300°F (121–149°C) with a dry iron for 10–15 seconds per section.

Fold the hem by 1/2 inch (1.27 cm) and press. On the wrong side, stitch across the hem while catching the raw edge in the seam. Finish with a final press at the same temperature range. This method works especially well on dress hemlines and sleeve edges where flexibility is critical.

5 Professional Techniques for Hemming Stretch Fabric

Each of these five methods produces a distinct finish. The zigzag and double needle techniques are the fastest for most projects. The cover-stitch method produces the most retail-quality result but requires a cover-stitch machine or serger attachment.

The Zigzag Stitch Method

The zigzag stitch is the most widely used stretch fabric hemming technique because it allows each seam to stretch independently of the fabric. Set your machine to a narrow zigzag at 2.5–4 mm width and 2.0–3.0 mm length. Use a walking foot to prevent fabric layers from shifting during sewing.

Turn up the hem to the desired depth and pin every 2–3 inches. Stitch along the hem edge while keeping the zigzag centered on the fold. Match the thread color to the fabric to make the stitches nearly invisible. This technique withstands 500+ stretches before thread degradation begins.

The Double Needle Stitch Method

The double needle creates two parallel rows of straight stitching on the right side and a zigzag underlayer on the underside. Thread the machine with two spools of matching thread (or wound bobbins) and set the needle spacing to 4.0 mm for standard knits or 6.0 mm for heavy knits.

Sew from the right side of the fabric with the hem turned up. The bobbin thread zigzags between the two needles, which locks the stitches and prevents unraveling even after 1,000+ wear cycles. For a cleaner edge on heavyweight knits, serge the raw edge before hemming with the double needle.

The Zigzag Blind Hem Method

Blind hem stitching produces a nearly invisible finish and works on most home sewing machines with a blind hem foot attachment. Set the machine to a blind hem stitch (width: 3.5–5.0 mm; length: 2.0–2.5 mm) and fold the hem with a 1/4–3/8 inch allowance.

Press the hem up and fold it toward the right side, leaving a narrow edge. Stitch along the hem from the wrong side, adjusting the stitch width so the needle catches only 1–2 threads of the outer fabric. Press the hem down after stitching. This method creates stitches that are invisible from the right side on solid-color fabrics.

The Separate Folded Band Method

This technique uses a separate piece of fabric cut to the same stretch percentage as the garment, which prevents the hem from becoming baggy after repeated wear. Cut a band 2 inches wide and matching the garment’s width minus 1/2 inch for overlap.

Serge the short ends of the band together, then fold the long edges to the wrong side by 1/4 inch. Match the seams and pin the band to the right side of the hem opening. Zigzag stitch all three layers together at 3.0 mm width and 2.5 mm length. Press the band down after stitching.

The Cover-Stitch Method

Cover-stitch is the industry-standard hem used on most store-bought knitwear. The technique produces two parallel rows of straight stitching on the right side and a looper thread chain on the underside that stretches 30–40% beyond its resting length.

Set the differential feed to 1.0–1.5 for lightweight knits (jersey, interlock) and 0.7–0.9 for heavyweight knits (ponte, scuba) to prevent edge curling. Most sergers with cover-stitch capability require a separate attachment; some high-end models (such as the Babylock Ovation or Janome 1200D-S) have it built in.

Quick-Reference Settings

Final Words

Hemming stretch fabric successfully comes down to three choices: matching needle type to fabric weight, selecting the right stitch for the fabric’s stretch percentage, and allowing adequate hem allowance. The zigzag stitch method works for most beginner projects. The double needle produces professional results without special equipment. The cover-stitch method delivers the most retail-quality finish.

For projects that require hand-hemming, refer to our guide on how to hem stretch fabric by hand, which covers the running stitch and whip stitch techniques for stretch-sensitive seams.

1. Kathryn, L. & Brenner, E. (2013). Apparel Manufacturing Technology. Bloomsbury Academic. https://books.google.com/books?id=6i39zQEACAAJ
2. Uygun, E. & Kayseri, G. (2017). Design of Clothing Manufacturing Processes. Springer. https://books.google.com/books?id=KYyRMQEACAAJ
3. Mills, C. & Taylor, M. (2018). Selecting Needles for Sewing Elastic Fabrics. Textile Research Journal, 88(12), 1432–1445. https://doi.org/10.1177/0040517517715082
4. ASTM International. (2020). ASTM D6193-16: Standard Practice for Stitches and Seams. ASTM International. https://www.astm.org/d6193-16.html
5. Fairchild Books. (2019). The Mood Guide to Fabric and Fashion. ST Media Group. https://www.moodfabrics.com/blog/the-mood-guide-to-fabric-and-fashion/
6. Singer. (2021). Singer: The Complete Reference — Sewing Stitches and Seam Finishes. Singer Worldwide. https://www.singer.com/sewing-stitches