Cool stuff. Thanks.
I was looking for some t-shirts as well. Everytime Donovan Waite sensei does a seminar at our dojo, he always has all of these Aikido shirts and that made me want to start collecting some as well. Usually I only find BJJ, Karate, or TKD shirts.
Check this link from Cafe Press. Some cool stuff.
The link seems really long; hope it works.