Zenmondo Wormser has come up with a spiffy t-shirt slogan generator for those who don't "build" clothes in Second Life. Here's my first attempt (left). I'm wearing it over a long-sleeved undershirt, I tinted it grey, and I left some of the black "non t-shirt" area for trim.
"Look! I'm an Arkham co-ed!"
Zen plans to release a fancier version later, with font choices, etc., but for now it's a quick way to make a t-shirt with a front and/or back slogan!