French Seam

A French seam is a seam sewn twice: once with wrong sides together to trim and enclose the raw edge, then again with right sides together to bury that trimmed edge completely inside a narrow tube of fabric. Nothing frays, nothing shows. On the inside of the garment it just looks like a tidy little tuck.

I reach for this one constantly on sheers — chiffon, voile, lightweight cotton lawn — anything where a serged or pinked edge would show through and look messy, or where the fabric frays if you look at it wrong. It's slower than a single pass, and it doesn't work on curved seams without some fussing (armholes are a pain), but on a straight side seam it's genuinely satisfying to sew.

My rule of thumb: first pass at a scant 1/4", trim close, press the seam open-ish, then fold and stitch again at 3/8" so the raw edge is fully swallowed. Press flat and it disappears.

How I do it:

1. With wrong sides together, stitch a scant 1/4" seam.
2. Trim close to the stitching — right to the edge, no stray threads.
3. Press the seam so it's flat, then fold right sides together, pressing again so the seam line sits exactly on the fold.
4. Stitch a second seam at 3/8", enclosing the raw edge.
5. Press the finished seam to one side.