So all this emphasis on the so-called "tackiness" of it, what about your reasoning about professors being anti-greek?
ETA: and then why wear ANYTHING Theta at all? It's all the same, just because someone can't see it from 500 feet away doesn't mean people don't see Kappa Alpha Theta spelled out on your shirt.
The chapter in question's webpage (loads VERY slow):
http://www.ku.edu/~theta/
I'm having a terrible time trying to get it to load, but it seems that there are pictures of chapter members in block letter t-shirts, a group picture in front of HUGE wooden letters, etc.