Rolled hem (serger)

A looped stitch formed by a single needle thread interlocking with a looper thread in a chain-like pattern beneath the fabric, used alone or alongside cover stitching.

A machine that sews two or three parallel rows of straight stitching on top with interlocking looper threads underneath, used for hems and flat seams on knits.

A serger stitch sewn with loose tension so the seam pulls flat and open, leaving a ladder of thread on one side, often used decoratively on knits.

A hook-like mechanism on an overlocker or coverstitch machine that carries thread beneath the needle plate to interlock with needle threads, forming the stitch's underside.

A machine that simultaneously trims a fabric edge and encases it in interlocking looped thread, using multiple threads, needles, and loopers to finish seams quickly.