Earlier we saw these great posters to let the world know you are against gender violence. Instead of having a poster why not wear one?
This T-shirt is just one offered by SAFER (Students Active For Ending Rape). Some of all these others are even better, depending on what angle you want.
I'll bet you wear a bunch of t-shirts that advertise stupid over-priced crap, how about giving free advertising to something worthwhile instead?