Printing on t-shirts is the bane of every printmaking professor. Students always want to try it, it's messy, and you end up with mostly stupid looking stuff. And so, I contributed to this problem by teaching the printmaking class at El Camino Community College how to do monoserigraphy on t-shirts.
I also did some live printing of this technique at the recent CSULB annual Holiday Sale in the Werby Gallery. I should have photos of that soon, taken by my friend Salvador, but he's working on his finals right now so it might not be till next week.