Sister Halloween Costumes: Hilda and Zelda Spellman From "Sabrina the Teenage Witch"
What to wear: Hilda is a little bit more out there with her wardrobe, so wear bright colors in splashy patterns. For Zelda, grab a pencil skirt and a turtleneck sweater.
How to act: Chase after (imaginary) Salem and ask people if they've seen Sabrina.