How do I replace a ripped out gromet type button on jeans?

I have several pair of jeans that are tight enough in the waist that over time, the metal button (the type machined through the fabric) has ripped out. The result is a pretty big hole in the waist band around the button area. Any great solutions for repairing that hole so that I could sew a regular button on? These are all Aura Jeans by Wrangler that fit every other way. Also is you have any ideas on how to let out just the waist band on new jeans maybe I could prevent this from happening again :)