it has not evolved much. and i believe that's a good thing. this is the reason why emails from 20 years ago look the same even if you open them today. given the short life of everything on the internet, email is a wonderful thing.
Also humans seem to need fashion as a mechanism to show belonging and distinction. (Differentiate form parents generation, show affiliation to some sub culture, ...)
And then there is the hope to make the production more efficient. (Which may not work out)