This is the story of a pair of boxer shorts. They are cotton with an exposed wide elastic waist that says Old Navy and very soft. They were given to my son but at the time they were a size too big so he didn't want them.
Since I wear hand me down boxers for pajama shorts in the summer I appropriated them. I don't care if they're too big, they're comfortable. They were worn and washed hundreds of times until finally the elastic gave out. No problem, they were too big anyway, right? I simply cut off the elastic, serged the top of the fabric to keep it from unraveling, then folded it down and sewed the fold in place for a very easy casing which I filled with a slim elastic that I tied together at the ends. I wanted to be able to replace it easily if this elastic wore out as well. I planned to wear these for another bunch of years, until they were nothing but threads thank you very much.
You can see the edge of the waistband elastic in this one.
I plan to add patches as needed until there is no more room to patch. ;)