Betty Rubble Costume Betty Rubble Costume - Flintstones Costumes for Women - Funny Costumes - Adult Halloween Costumes - This funny Betty Rubble costume includes the Betty Rubble costume dress, belt and the wig with bow. PLEASE NOTE: Sizing for this costume - Medium fits most who wear dress size 10-14; small fits most who wear dress size 4-8; extra small fits most who wear size 2-6. Cave craze! Gender: Female Age: Adult Theme: TV & Movies Occasion: Halloween Size: Womens X-Small Color: As Shown