This is where I admit that I got my daughter a pair of teeshirts for her recent birthday--
one is a Reading Rambo shirt (cut for young women, by the way), and the other was a more complex design involving a t-rex dividing by zero whilst a meteor hurls to the earth in the background.
She adores quirky/geeky teeshirts. Woot Shirts (Shirt.woot) makes a lot of things which are suitable for middle school girls, and as noted, they make them in ladies/juniors cuts so that they actually fit. Amazon often has a good selection of them.
