Fashion that goes against the norm of what is considered normal, beautiful and practical is descripted as alternative fashion.
Common misconception is that alternative fashion is a product of second half of 20th century. The truth is, it was always there!
Quite possibly that it all started with one rebellious cave-girl who didn’t want her fur boots to match her fur top. It is also possible that all of us rebellious bastards descended from that rebellious cave-girl.

Alternative fashions was always there to identify, and even stereotype, members of groups with value systems that diverged from common culture.
And also, it has a porpoise for us who like to stick the middle finger to the norm, we can identify each other and know who the cool people are.

According to Wikipedia article:
“Alternative fashion has traditionally been related to subcultures that have been identified by mass society as:
Disinterested in common moral order: idle, parasitical, hedonistic, criminal
Disinterested in or against adhering to structure of social class
Identification with an area (street, neighborhood, club) rather than self-owned property
Preferring to develop "family" and community outside of traditional paradigms
Attitudes against or wary of mass production, homogeneity, socially imposed behavior constrictions” or basically anyone with half a brain and at least a bit of spine.

More often than not, mass social perception of the fashion and its relation to some niche group is more important than the actual message or self-expression. We have to know what the mass thinks our clothes mean before we can try to establish any kind of contact.

Not that we want that contact that bad, it is just hard to buy bread in the morning if a sales lady is screaming her loughs out because we have full zombie makeup and a real chainsaw strapped to our back