Regarding men's fashion, I find it interesting that:
Long robes are still worn as formal/professional attire in certain contexts: judicial robes, academic regalia, clerical robes, etc..
Wigs seem largely out of style, with the professional exception of British judges and barristers.
Kilts are still around, but tunics are out of fashion and tights/leggings seem to be relegated to sports/athletics and dance.
One of the messages is "We are not here to do manual labour, fight physically, or display overt sexuality."
(Kilts are something of an exception, but they're dual-use.)
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.)