I'm a big fan of tee shirts. I wear a tee shirt or two just about every day of the year. Even in the dead of winter I'll wear a tee shirt under my jacket.
I'm guessing I have about twenty tees in my current rotation. The oldest one I still wear regularly is now twenty years old. It's a Pearl Jam shirt I bought when I saw them at Molson Park in Barrie back in '98.