Depends on what you are going for:
If its sexy-
a red vinyl my dress, red fishnets, tail, horns, pitch fork, and heels.
If its sassy/funny-
red pumps, tight red or black pencil skirt, black collared button up shirt with red tie, sort of like a naughty librarian. after all she has hell to run ;)
I personally like the second one better, but you could totally wear a combination of the two. A good visual reference would be Elizabeth Hurley in bedazzled, where she plays the devil.
A dress or a nice pair of pants and a dress shirt
A boy can dress like a girl by wearing clothing a girl would wear, such as a skirt and blouse, dress, pants or jeans and a shirt that girls would wear, etc.
you should wear a blue sparkly dress that is if youre a girl a boy wear a tuxedo
the girl should wear what she think her mood is so happy a witch or a doll cutsie a devil or angel
i wouldn't wear a dress. just be casual, but still pretty. if you do wear a dress, wear a blue one. blue is his favorite color to see on a girl. i guess wear blue even if you don't wear a dress.
devil devil zoombie devil/angel if u wear white 2
if ur A girl wear a dress if ur a guy wear something there. its not tht hardddd
well you should wear a dress with a mask (if you are a girl) or wear a tux. with a mask( if your a guy) or watever you like
you should wear a dress and black or white heels and put your hair down with curls
if its a date and they dont have blues then a guy should wear a tux or suit and a girl should wear a really nice dress
she should wear a long shirts in black color with trousers.
she would wear a nice dress or maybe something for the season