The Fringe Foot, sometimes referred to as the "Tailor-Tacking Foot", has a raised bar at the front which causes the thread to stand away from the fabric. Using a simple zig-zag stitch you can create beautiful surface texture, custom trims, fringe flowers and appliques or use it to create traditional tailors tacks.
 
If using it for tailor tacking, once the thread loops are formed, pull the fabric slightly apart and cut. What you will have is perfect thread markings left on your fabric.