7. Schoolgirl Skirts
Starting with Clueless and culminating with Britney Spears's . . . Baby One More Time, schoolgirl skirts definitely had a big moment. But while we love plaid, the grown-up closet should do it in a skinny trouser, pencil skirt, or silk blouse. No pleats or sky-high hemlines, please.
8. Sorority Letters
For a certain type of girl (and school), Greek letters are one of the top collegiate accessories. While it's tempting to slip back into the happy days you associate with them, be warned: nothing's more off-feeling than seeing someone who's clearly past college sporting a sweatshirt or tee.