Here is a great foot that comes with most machines, the Overlock Foot #2. This foot is a wonderful staple especially if you don't have a serger/overlocker. This foot is perfectly designed to finish off your seams to prevent them from fraying and also even nice for sewing some knit fabrics. The little guide/pin underneath the foot holds your stitches nicely to prevent your fabric from puckering. If your machine didn't come with and overlock foot it is one that you should consider adding to your collection.
#2 Foot is designed for 5.5mm stitch width machines
#2A Foot is designed for 9mm stitch width machines
