I realized about halfway into this project that I should be snapping pictures. So forgive the fact that the first few steps do not have pictures to go with them. The finished size of this nap mat is approximately 20 inches wide x 55.5 inches long. You are basically making a mini quilt and sewing on fabric for a pillow, plus straps.
Step 6 - Zig zag (or serge) top and bottom edges, then turn edge in 1/4" and stitch. These edges will be attached to the top of your mat (front and back) and will form the pillowcase. Set aside.