Diy Betty Rubble Costume . Making a barney and betty rubble couples costume. Mens deluxe bamm bamm costume. Dress like Barney Rubble from The Flintstones Costume & Cosplay Guide from www.pinterest.com For wilma i bought a plain white dress that was just a swimsuit cover up. 5 out of 5 stars. Then cut the bottom to make it raged looking.