Popsugar Entertainment Halloween Costumes 2021 The Best Pop Culture Halloween Costume Ideas For 2021 60 of the Best Pop Culture Halloween Costume Ideas For 2021, From Marvel Heroes to Cruella de Vil 9 September 2021 by Alessia Santoro View On One Page Photo 28 of 56 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 28 Cassie From Promising Young Woman What to wear for Cassie: Cassie's look in the final scene of Promising Young Woman is the perfect costume for Halloween. Wear a nurse's outfit with a colourful wig, and don't forget to look like you're up to no good. Previous Next Start Slideshow Halloween Costumes 2021Halloween Costumes For MenGroup Halloween CostumesDisney Halloween CostumesHalloween Costumes For WomenCouple Halloween CostumesPop Culture Halloween CostumesMoviesHalloween CostumesHalloween