I went back in time and aborted Jesus
 

So how many concert shirts do you have? I've got 9. I had more, but they were lost since back when I went to a lot of concerts I was too little to fit into the shirts

I used to have tons, Iron Maiden, AC/DC, Black Flag, Nirvana, Butthole Surfers but they've crumbled to dust. Now I'm old and avoid stadium shows (but still play small clubs myself) and all I have left is the 1st Lolapalooza tour shirt...and it's a mess.

Four Iron Maiden--Killers, Piece of Mind, The Clansman and The Trooper.
One Dio--Holy Diver
One Ozzy--Crazy Babies
One Slayer--Rein in Blood
One Archenemy--Doomsday Machine
One Weird Al Yankovic.

between '94 and '97 I went to a lot of concerts. But after that we stopped going for a while, and then I started having issues with large groups of people, so now I don't really have much desire to go to concerts. If something really special happened like Pink Floyd or FNM had a reunion tour or something, maybe. I'd also consider going to a Jetpack show, but other than that I'd much rather stay home and listen to music on my own.

Do normal band t-shirts count, or ones you get from a concert only?

concert only

as much music as I see, I tend to get a poster or a cd. never really got too many shirts

but I have a couple,
a brighteyes from 6 years ago
mayday
bonnaroo shirt from 2004(ground score)

well I have a few

None.

I've got quite a few.

Cannibal Corpse
Six Feet Under
Witchery
Nile
Cradle of Filth
Marduk
Deicide
Morbid Angel
Dimmu Borgir
Immolation
The Haunted
In Flames
Slayer
Soul Fly
Marilyn Manson
Monster Magnet

I think my old Stone Temple Pilots one from the Core tour is around somewhere. It's so worn out, though, it's unwearable. I also had a Jackyl one from when I saw them when I was 14. It's long gone, though.