I know a lot of collage students are into the whole preppy look, but in my opinion button up isn't to classy. There is a slideshow of different kinds of button up styles. In my opinion, the shirts are cute and the models are gorgeous, but they aren't in style, certainty not helping an preps-ter look preppy.
Of course, who am I to judge? I haven't even left my teen years and I don't even own a true button up shirt, except my plaid shirts that I always leave unbuttoned. If I could go to the store right now, I certainty would not pick up a button up shirt. I say that the preppy look isn't for me, and I also say the button up doesn't go in the preppy category, but really, it does.