Advice For SADIE HAWKINS DANCE!!!?

Okay i just found out that my school is having a Sadie Hawkins Dance and i'm totally excited. But i want to ask someone too it but i really don't like anyone and i don't know i do have this one person in muind but idk.and i was wondering what i should for a dress the theme is Black and white and i was wondering what kind of dress i should get and/or if i should buy on or borrow.. and any other advice you have would be super!!! ***