Overlocker Thread

Because several threads work together in an overlock seam, the individual thread does not have to be as strong as for a straight seam. Finer thread gives a softer, flatter result against the skin.

Colour choice is easier here: in the finished seam you usually only see the looper threads at the edge. Many people sew with neutral shades and change only the needle threads when an exact match matters.

When threading, the order matters — usually lower looper, upper looper, then the needles. Your machine manual sets it out; the wrong order produces a tangle instead of a seam.

Buy four matching cones rather than four different leftovers. Different threads pull differently and the seam curls or draws in.