I used to work at a gym where the staff was allowed to work out after closing. I was working out with my gym bro late one night when suddenly he took his shirt off, flexed, and roared like the Hulk. We were both laughing, but also realized we didn't have to have our shirts on at that time, so I took mine off, too. There was another staff member working out late that night, and when he saw us lifting with our shirts off, he took his off, too. We all got great workouts in.

I don’t even know why you’d wear a shirt at all, in your dorm. I never wear one at home.