Gorilla Glue or other similar polyurethane glues will not work for this type of application. They are designed for gluing tightly-fitted joints in wood. On fabric, you'll end up with a foamy mess that has no strength.

The Goop products sold at Home Depot will do the job. It doesn't matter which one you buy, as they're all the same except for the Marine Goop, which has UV inhibitors added. That's only a concern if the glue will be subjected to direct sunlight exposure.