In the Frat / Hippy war, you'll acquire items that are marked as Quest items.These items are only good for trading into the "war camp", nothing else.

This style with highlight the items in whichever camp you're in (I'd recommend going to both after you've finished the war, but before you visit the losing side in the winning side's outfit).

[Edit]
I'm planning on collecting all the quest highlight styles I've created and putting them into one. Just a heads up.