Embrace the nerd in you with a geeky homemade costume.
What you need to do: Wear a pair of glasses and stick a bandage in the middle to heighten the geek effect. Wear suspenders if you have them, or pull your pants or skirt up high and tuck your shirt into into it. Remember to wear dowdy and very unsexy clothes. Putting pens and a calculator in your shirt pockets helps as well. Carry around several academic books.