I only know what I know so prove me wrong. I think almost all other forms of art, from music to television and cinema to sculpture and mixed media and painting to dance all have proletarian channels, but fashion is almost exclusively for the wealthy. Arguably also it seems to me that a lot of culinary art tends to cater to the wealthy too, so fuck that as well.
Think you're conflicting fashion in general with Runway fashion, that kind of "haute-culture" high brow shit is definitely bourgeois as fuck but people have always dressed up in cool and interesting ways.