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 29 of 41 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 29 Sister Halloween Costumes: Evanora and Theodora From "Oz the Great and Powerful" What to wear: Evanora needs elaborate black dress, while Theodora needs a big red satin dress with a flat-brimmed hat. How to act: You're both pretty evil, so act wicked and ask anyone if they've seen Glinda around. Previous Next Start Slideshow HalloweenHalloween CostumesPop Culture Halloween CostumesTVMovies