I just won a t-shirt for having my email read on the show, so I plan on wearing it on my next trip.
Last year, I made my own shirt- Lime Green of course, that on the back asked Do You DIS? this caught the attention on another Diser in line at Expedition Everest and we struck up a conversation, and found out we had conversed on the boards about possibly meeting up while we were there but had never worked out a time to meet.