A bit like wearing a tour tee shirt of a band you've never seen.
Lots of younger folks wear concert shirts. It's very cool to see folks wearing shirts from bands that stop touring years before they were born.
I wear my Smiths shirts and I've never seen them in concert.
On the other hand, I'll only put logo golf balls from courses I've played in the display case and only wine corks from bottles I've drank from in my cork collection.
As far as shirts go, I buy golf apparel that are overruns from the guy at the local flea market for cheap. They have all kinds of crazy courses or tournaments embroidering in them.
When I see people wearing Ramones tee's I make a point of asking their favourite album. Usually I get blank looks but very occasionally it sparks a decent conversation.