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 4 of 11 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Henry Mills What to wear: A collared shirt, jeans, and a black peacoat. Don't forget your book of fairy tales. How to act: Try to convince everyone that they're all fairy-tale characters. Previous Next Start Slideshow HalloweenOnce Upon A TimeHalloween CostumesGroup Halloween CostumesPop Culture Halloween CostumesTVDisney Halloween Costumes