Staystitching is a single row of ordinary straight stitching, sewn through one layer only, just inside the seam line on any edge that could stretch. It is done immediately after cutting, before the piece is handled.
Why it is needed. A neckline, an armhole or a shoulder seam is cut across the grain, close to the bias. Bias edges stretch simply from being picked up, pinned and carried around. By the time you come to sew the neckline it can be a centimetre longer than the pattern piece — and it will never fit the facing or collar.
How. Straight stitch, length 2 to 2.5 mm, sewn 2 to 3 mm inside the seam line so it will be hidden by the finished seam. One layer at a time. No backstitching needed.
Direction matters. Sew from the wide part of a curve towards the narrow — on a neckline, from the shoulder towards the centre front on each side. Sewing in a consistent direction on both halves keeps the two sides identical. Sewing right around in one pass drags the fabric in one direction and distorts the neckline.
Where to use it. Necklines, armholes, shoulder seams, waistlines, and any curved or angled edge on loosely woven or stretchy fabric.
Where it is unnecessary. Straight edges on grain, and edges that will be sewn immediately.
It is not a stay tape. Staystitching resists stretch; a fused or sewn-in stay tape prevents it entirely and is the better answer on knits and on shoulder seams in tailoring.
Questions people actually ask
Does staystitching show?
No — it sits inside the seam allowance and disappears under the finished seam. There is no need to remove it.
My neckline already stretched.
Steam it gently over a ham and let it cool, which recovers some of it on wool and natural fibres. Then staystitch to hold what you have recovered.
Last reviewed 2026-08-11