How do I tie off a pillow stitch?

Start inside of your hem. Hide your knot in the fold of the hem. Right next to where you started, on the other side, pick up with your needle just a few threads in the fabric. Then go right back down into the fold of the hem. The needle will follow that fold, so the thread stays hidden as you make your seam. Pull your needle out of the top of the fold. Right next to where your needle comes out of the hem, threading needle back through your stitching. Repeat until you finish your seam, then tie a knot close seam, then pull the excess thread back through your stitches without piercing the front of the fabric. After about an inch, cut your thread off your needle.