Some people have worn the same article of clothing to every game or sporting event for years; whether they are playing or just attending. It's a kind of superstition to wear the same thing everytime without washing it. Mark Aho had this John Lennon shirt printed 29 years ago, and since then, he has worn it to every single concert that he has gone to which is about 350 concerts. If you are wearing the same thing to every single concert you attend, it definitely takes the "what should I wear" question right out of the equation. Doesn't matter if it's AC/DC or Willie Nelson or anything in between, Mark Aho is wearing that particular shirt to the show.