If they don't care, it could get out of control, with them daring each other to wear tutus and dress up as fairies to prove how manly they are. If they do care, then... well, Nepleslia is already known for gang warfare. I suppose having different ideas of what manliness means is a good reason to get into gang fights. Like, the guys who wear pink vs. the guys who wax their legs to wear bicycle shorts, and so on.
Nepleslia as a whole doesn't need to be defined one way, but unless every unit in its military has its own independent policies, there's probably got to be some consensus on what manliness means, at least to the point where they can give options like kilts or no kilts without someone asking if they can wear chaps, too.