The Gathering Foot is used to form soft gathers in fabric. You can gather a single layer of fabric, or you can join a gathered fabric to a second, flat fabric simultaneously.
I used the foot to gather some broderie anglaise t go around a Laura Asley print tablecloth that I made. It now resides in France.
Excellent piece of kit. Needed to watch the “how to” guide on utube, and practice all afternoon. The end result was very professional looking. Note, I gathered first, then sewed on, I did not use the combined action of the foot.