Popsugar Popsugar Harry Potter Easy Cosplay Costumes: Black Widow October 21, 2016 by Ann-Marie Alcántara What you need: For your Black Widow costume, you'll need a black jumpsuit with long sleeves or a leather jacket and black pants. Bonus if you can add red hair dye. Harry PotterHalloweenAdventure TimeHalloween CostumesWonder WomanPokémonDIY Halloween CostumesStar WarsMarvelHalloween Costumes 2020