If it is under 1/8 thick, I usually stem stitch an embroidery line in. If it is 1/4 inch stem, I cut about an inch bias strip. I fold it in half with the right side out, I stitch through the piece with the 1/4 inch fold on the left of the hand stitching line. Once I have it stitched down, I trim the raw edges off until about 1/8 from the stitching line. I then fold the 1/4 inch fold over the stitching line and hand stitch the fold down.