Visible Mend Journal / seams

Read a Split Underarm Seam

Separate a popped seam from a fit or movement problem.

Inspect first

With the garment off, open the underarm area gently. Find whether stitches broke cleanly or fabric itself split close to the seam.

A modest hand path

If it is only a short stitch failure and the allowance is sound, align the original seam and hand backstitch past each end. Keep the armhole shape unchanged.

An everyday example

A casual cotton top with an isolated broken stitch line differs from an underarm whose weave has torn after repeated reaching.

When to stop

The underarm moves and can be stressed. Repeated failure, tightness, or torn fabric calls for alteration or professional repair; do not promise the hand mend will last.

Keep a repair note

Record the first wear check and whether pulling reappears at the same point.

Material and follow-up details

The underarm is shaped and mobile, so thread flexibility and the original curve matter more than making the stitches almost invisible. Use a small needle and thread compatible with the garment, and support the two allowances while stitching instead of pulling one toward the other. If the top is knit, a rigid line of tight stitches can pucker or break as the arm rises; treat uncertainty about a suitable stretch-compatible repair as a reason to ask a repairer. Check the top with the arm lowered and gently raised, without stress-testing it. If the new line distorts the sleeve or the gap returns after an ordinary wear, record that pattern and stop repeating the same quick closure.