I think it’s less treating it as a costume party and more that certain genres have styles associated with them. Although, I wouldn’t be surprised if groups of fans coordinated that kind of thing.

I went to a Social Distortion, Descendents, Chats show over the weekend where everyone was pretty much wearing black and semi-rockabilly clothes. I felt very colorful in my forest green tank top and light blue jacket. I’ve been a fan of Social D for decades though, so I didn’t feel out of place. It was funny walking around near the venue because I could pick out exactly who was going to the show simply by their clothing which included lots of punk band shirts.