I don't know about everyone else, but I have a problem with jeans gaping at the back waistband. They fit well everywhere, except at the waist. So here's a quick fix...maybe 15 or 20 minutes tops!
No need to pick off the whole label, just the sides that are getting in the way.
This website has a great tutorial of an alternate way to do this if you don't want to cut the inside lining of the waistband. I, however, didn't mind have a slit and would rather not have to do some topstitching that is required with the other method.
With one side of the elastic secured, put your jeans on and snug up the elastic to the proper fit. Pin in place. Trim off the excess elastic and zigzag the end like you did before. Restitch any label.
A simple fix to a gaping problem!
I like to link to these great parties.