I used to own quite a few. Cheap Trick, Uncle Ted, Zep, Maiden, The Coop, etc.
I probably had 20 or better.
Now I have three.
A long sleeved white KISS tee with the Love Gun cover. My kids got me that for Christmas a few years back.
A white tee with a 12" x12" closeup of Avril's face. I actually had this tee made because the only mechandise you can find for Avrilis either too small or pink.
My prize, though, is a black Stevie Ray Vaughan tee. the image is SRV from behind with a green spotlight on him.
It's 23 years old, and I wear it less and less because it's starting to disintegrate. I won't ever get rid of it.