Popsugar Entertainment Halloween Costumes 2019 Downton Abbey Halloween Costume Ideas Go Back to the '20s With These Downton Abbey Halloween Costume Ideas 10 October 2019 by Kelsie Gibson View On One Page Photo 9 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Lady Mary Crawley What to wear: A flapper dress, layered necklaces, long gloves, and a short bob wig with bangs. Previous Next Start Slideshow Halloween Costumes 2019Downton AbbeyMoviesHalloween CostumesHalloweenTV