See also: metal thread embroidery.
Digital source of illustration (retrieved 8 June 2016).
GVE
Flat worm (also called oval thread) is a form of metal thread made from a flattened metal strip that is loosely wound around a core yarn. This gives it a spongy feel. The thread is then lightly flattened so that the finished appearance is similar to broad plate, but is more flexible and therefore easier to handle while stitching. The thread is normally couched down with a thread with the same or contrasting colour.