Star in your own Sister Act when you wear a nun costume this Halloween. Nun costumes for women, men, plus size, and children come in various versions from traditional to shockingly funny. These women's nun costumes have long black robes made of synthetic materials and typically include the veil and wimple to compliment the habit (robe). Accessories your nun costume with bibles and crosses for the holiest of looks. You can also find inspiration for a scary nun costume from films and tv shows like The Nun or American Horror Story: Asylum.