Cut fabric into strips that are 3-6 inches wide and 20-22 inches long.
Fold down one end of the fabric strip ½ inch.
Fold strip in half lengthwise, right sides together. Pin.
Sew a ¼ inch seam along the long edge of the strip.
Use the safety pin to turn the fabric tube right side out.
Cut an 8 inch piece of elastic.
Use the safety pin to run the elastic through the tube.
Overlap, pin and sew the ends of the elastic together.
Tuck the unfinished end of the fabric tube into the finished end of the tube.
Sew along the overlapped ends of the tube.
This process can be done by hand as well using a needle and thread and hand sewing instead of machine sewing each step.