In modern Western and Westernised societies, it's very clear that men's fashion is very limited.
Almost any outfit consists of a shirt/t-shirt with trousers/jeans/shorts. There are only very minor differences in cut- frex, when I'm chooising trousers for work I pretty much have a choice between blue, black, grey and brown and between solid and pinstriped. There are a few more choices but not really that many more. As for shirts, you always have the standard shirt with only a few variations like lapel size, cuff style or tightness.
Compared to this the women's ensemble is incredibly varied with many different types and cuts of skirts, trousers, blouses and t-shirts.
How can we retain or introduce more variety into everyday menswear, both formal and informal?
For example, trousers didn't really become widespread for formal wear until the early 19th C- before that breeches were the norm. Perhaps we could have a situation where breeches and knee-breeches were retained alongside trousers? Or perhaps a fashion cycle like in female fashion with breeches and trousers switching in popularity on a thirty year cycle.