Heh, I've experienced the shirt unintentionally rise up when bending down/crouching before, generally I try to bend or crouch with my back towards the wall, or where nobody was nearby. Also I was saving this for another post, but RL got in the way for a bit.
I have a few pairs of old cargo shorts I generally wear when running errands and doing quick stuff, half of them the buttons have long since worn out, and I've been a bit lazy in getting them fixed, so to remedy it, I just wore them with a belt, but sometimes that doesn't stop them from sagging, and it's not the first time where my shorts would be literally hanging by my knees when I walk, and thankfully I haven't been spotted/caught, yet. lol
Also fairly recently, my washer broke, which stinks, meaning I had to bring my clothes, and thongs to the laundromat, and I always felt a bit nervous when moving my thongs to the washer or dryer, so I always "covered" them with a pair of briefs, and a boxer (that I never really wear anymore) so nobody didn't see.