Adult Wilma Flintstone Costume Adult Wilma Flintstone Costume - Authentic Flintstones Costumes for Women - Funny Halloween Costumes - This funny Wilma Flintstone costume includes the Wilma costume dress, the wig and the necklace. The packaging on the medium says that the costume fits a size 10-14. Positively prehistoric! Gender: Female Age: Adult Theme: TV & Movies Occasion: Halloween Size: Womens X-Small Color: As Shown