Dorm XL Sheets
Well most likely the bed in your dorm room will be a twin extra long. So you will need sheets to fit. Don't settle for discount store brands (if you can even find extra long there) that feel like sandpaper, when you get get quality brand names here with high thread counts, in all colors and patterns, for the same price. Buy a set with the bottom fitted and flat top sheet with pillow cases included. Even if you don't like to use the top sheet it always comes in handy for the occasional Toga Party.
Two sets are nice to have so you can leave your laundry in the clothes dryer over night and still have something to put on your bed.