Popsugar Entertainment Halloween Downton Abbey Halloween Costume Ideas 15 Proper Downton Abbey Costumes You Can Wear This Halloween October 26, 2019 by Kelsie Gibson View On One Page Photo 15 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 15 Isobel Crawley What to wear: A long-sleeve beaded dress with a long necklace to match. Previous Next Start Slideshow HalloweenDownton AbbeyHalloween CostumesHalloween Costumes 2019TVMovies