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Athletic/gym gear, tank tops, bike shorts/leggings, speedos, etc. aren't really formal clothing, and they are practical both for physical activity and for fitness signaling (e.g. attracting mates and discouraging rivals.) (And sports from football to martial arts are a sort of ritualized fight.)

But I think you are on to something - men's attraction strategies are often via resources rather than health/fitness (or overt physical conflict with rivals.)

Academic robes and hoods were originally practical for keeping you warm in a freezing university. I can't imagine churches or abbeys were particularly well heated either. Another advantage of robes (or kimonos) is they can trap heat from external sources.

Re Kilts, I'm reminded of that scene in _Braveheart_ where the Scots start flashing and mooning the English before a battle starts.

there is nothing in Braveheart that should be thought of as historically accurate