Popsugar Entertainment Halloween Once Upon a Time Costumes For Halloween 10 Fairy-Tale-Perfect Once Upon a Time Halloween Costume Ideas October 31, 2018 by Kelsie Gibson View On One Page Photo 7 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 7 The Evil Queen What to wear: The most extravagant black dress you can find complete with a bedazzled matching headpiece. You may need some hair extensions to pull off this updo. Don't forget your poisonous red apple. How to act: Like you're the evilest of them all. Previous Next Start Slideshow HalloweenOnce Upon A TimeHalloween CostumesGroup Halloween CostumesPop Culture Halloween CostumesTVDisney Halloween Costumes