My gym shorts were literally falling off of me yesterday on my run. I wear spandex tighty tight shorts and cotton roll-waist shorts over those. The cotton ones were falling off my waist down my hips and stopped to rest on my lower hips (saddle bags). I had to keep pulling them up the whole time I was running. I had no idea they'd gotten so big. It's like it happened over night.
So I'm off to Target this afternoon to by size Medium workout shorts.
My run was great - 3.1 miles in 34 minutes, my fastest yet.