I don't understand why some people think that way regarding band T shirts.
It's surely the ideal time to wear a specific one is at that bands gigs?
It's almost as bad as every Summer when new football shirts are revealed and there's a handful who suggest that anyone over the school leaving age shouldn't wear a replica shirt anyway before getting into a discussion about who dresses the "most stylish"
I have loads of different band shirts and if am going to see a band I have a t shirt for will wear one of their t shirts, I'll also wear football shirst to the football.
Guess I'm just a saddo though