Now that I have Sirius (again, so much!), I'm interested in a few T-shirts that sadly are no longer being produced in the real world that I can tell. But no reason teen and adult Sims of both genders can't still have them (and using the same meshes you used for the Twilight T-shirts you made).
http://ui07.gamespot.com/1766/nintendo41_2.jpg This image was white (or light grey) on a black shirt, though (and that's what I'd prefer)
http://www.hrwiki.org/wiki/File:Limozeen_T-Shirt.PNG http://www.hrwiki.org/wiki/File:Limozeen_T-Shirt_Close.png These are two different views of the same shirt
http://www.myteespot.com/Dont-Make-Me-Go-Zelda-On-You-Zelda-Nintendo-T-shirt-p-6030.html
http://www.stylinonline.com/t-shirt-harry-potter-sirius-black.html
After these, my life (or rather, my game world) will be complete.