縫ぬい込こみ

noun

tuck; sewn-in fold

Refers to a fold sewn into fabric to adjust shape or fit, commonly used in sewing and tailoring.

• スカートのウエストに縫ぬい込こみを入いれてサイズを調ちょう整せいした。

  I adjusted the size by putting a tuck in the waist of the skirt.