Popsugar Entertainment Halloween 40 Best Sister Costume Ideas For Halloween 2023 40 Best Sister Costume Ideas For Halloween October 6, 2023 by Maggie Panos First Published: October 1, 2015 View On One Page Photo 32 of 41 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 32 Sister Halloween Costumes: Hilary and Ashley Banks From "The Fresh Prince of Bel-Air" What to wear: A purple skirt suit with a matching hat for Hilary and some jeans, a graphic shirt, and a smiliarly large hat for Ashley. How to act: Hilary isn't the brightest bulb, but Ashley is smart and full of quips. Previous Next Start Slideshow HalloweenHalloween CostumesPop Culture Halloween CostumesTVMovies