Stitch it!
Bulky Overlock Foot #12/12C was originally designed for stitching heavy sweater knits into garments.
The foot has a tunnel or groove on the bottom of the sole that allows bulky knit seam allowances to feed easily under the foot as the seams are stitched.
The most common use for this foot today is making custom piping to accent seams and edges of garments, pillows, purses, and other custom made projects.
See tips for use.