Fashion is a language. Some people learned it early and others late. Some learned it fluently and others hardly know five units of meaning. Some use it to say a lot of different things and others only a few.

Fast fashion vs the environment, workers' rights, and so forth.

Historical reenactment fashion. (Bonus points if a skill thus acquired Saves The Day from a non-fashion emergency.)

Cosplay doctors. (You know. The folks who go to cons with easily portable sewing kits and whatnot in case of fashion emergencies.)

Cosplay, full stop.

Scoring awesome $FashionableItem for cheap because it's last year's style.

Fashion with respect to gender and sexuality, and vice versa.