For Nancy: If you don't have long brown hair, get yourself a long brown wig, and pin it back on both sides of your head. Then, pair it with a cutesy striped sweater or button-down (buttoned all the way up, naturally), and a high-waisted skirt or jeans. If you go for a skirt, make sure you wear it with white tights and flats. Keep in mind Nancy's über cool accessories, which include her homework, notebooks, and a bat.
For Steve: So you want to be the popular guy, huh? Tuck a striped, long-sleeved polo into some belted khakis, and rock a pair of brown loafers. Feel free to pop the collar.