You will need:
Lace (mine was not stretch
First cut your jersey fabric into a strip about 6 inches wide then fold in half hot dog style and measure around your head then subtract an inch and cut. Sew along the raw edges from end to end and when your finished pull the tube right side out and slide that seam to the middle so it is not visible and flat on one side. Pin and sew the lace on. Final step you will now measure what you have around your head again and figure out the length of elastic you need cut it and tuck it into the opening on both ends and sew shut. VOILA YOUR DONE!