ok i feel like i wrote abt these before but here we go.. im sry im retarded:

Scout: Wears out of necessity/being forced, mostly at night due to bedwetting. Very embarrassed about it, would try to beat up whoever found out but would be a prime target for teasing.

Soldier: Probably a comfort wearer, daytime or nighttime. Possibly wears for forgetfulness/problems with interoception? He keeps it a secret, probably only tells his demo friend on the other team.

Pyro: Totally wears for fun, regardless of if they need to or not. Totally has a collection, with all sorts of cute designs, even if nobody else really sees them when they have their suit on. They don't attempt to hide this :)

Demoman: Hangovers cause him temporary bladder problems, definitely wears for that reason on nights he knows he's gonna be drinking heavily. Probably common knowledge, he doesn't make an attempt to hide it but doesn't parade around abt it.

Heavy: Tbh I don't think a lot abt him in abdl scenarios... I doubt he'd want to wear, given how much he makes fun of 'leetol baby men' etc etc.

Engineer: This man does not get up nearly as often as he should be for breaks, so he wears for this reason mainly. He also wears for fun, and loves the comfort they provide him. He doesn't parade this fact around, and he'd be pretty embarrassed if anyone found out (besides Pyro, he trusts Pyro with knowing).

Medic: If a merc needs to wear, he's offering to help with changes and checks. On long nights in the lab, he'll wear just to make sure he isn't interrupted by anything as bothersome as a bathroom break. He's pretty open about it!

Sniper: He wears out of convenience, as well as somewhat for necessity, too. He doesn't want to move from his sniper's nest, and jarate only helps so much, especially with such an overactive bladder. He does not want a soul to know, but I feel Medic would find out on his own accord and provide those much needed checks for him, since he can be a smidge forgetful about it.

Spy: He does not wear unless he is being utterly forced. He will hate every second of it and will cry if he has to soil himself in one. He'd kill someone if they found out he ever was forced to wear.