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.
I don't think that's the case, people also save up for going on vacation because it can be a fun new and engaging experience. Economic status doesn't improve or lower ones ability to appreciate high end (re: only can be made by the most talented folks) food, art, and fashion. The people who work in these fields often have interest in this stuff and are working class themselves.
There are very few hobbies that are just for rich people even if a rich person could afford a more luxury experience within that hobby or do it more often. Extreme sports comes to mind as being only for rich people.