It's funny, I did not read this thread because of the title, because I read my own interpretation of "just in case" and I realize how far gone I must be, heathwise--I ws thinking of clothes you pack in case someone vomits etc., accidents (both toddlers and elderly), sweatpants for post operation recovery, or the sweatpants my son wore for like 2 years when he was in bed after surgery on his leg and in cast for 8 months, then following year was in cast with same leg-- the one legged "just in case sweatpants."
Heck I'd get rid of them and buy something nicer, although I do keep a pair of paint pants and tee-shirts, although I don't have any right now, having painted and thrown them out.