I repaired it by buying some adhesive backed velcro which I stuck up on each side of the zipper opening and then sewed it in place with an awl using a lock stitch. The outside edges of the two strips are about 4 inches apart. I then cut a piece of manilla folder the shape of the outside of the velcro strips for a pattern and went to a local upholstery shop and had the other side of the velcro sewed onto a piece of fabric to make a cover that velcros onto the strips at the old zipper opening.
Looks a lot better than an opening with a hanging zipper.