For a girl:
Wear an orange T-shirt,(you can get them for like, 5$ at A.C. Moore) and a black skirt or pants. Buy orange and black hair spray at any Halloween store and spray half in half in your hair.(If you wear a skirt buy orange stockings to wear with it.)
For a guy:
Wear an orange shirt with black pants or the other way around it doesn't matter. Buy black and orange hair spray and do half and half in your hair.(You can get spray at any Halloween store).
Thanks to FireFly for this idea!