There is no compelling reason that obese, sweaty men need to stand or sit around for excessive amounts of time completely nude. There are even ones so fucking brazen that they won't even bother taking a towel or drawers to the shower to put on when they are done. Nude at the locker, nude walking to the shower, nude walking back to the locker...well, you get the point.
Get a damn towel and wrap it around you, is it that tough? Apparently, every day is one fine day to be nude:
(Apologies if the quality sucks)