Betty Rubble Diy Costume . Once finished, remove the thread from the whip stitch by pulling one end. Vinyl belt with attached plastic bone icons and velcro fasten at rear. How to Make DIY Flintstones Costumes— Bam Bam, Betty Rubble, Barney from edamommyblog.com Check out our betty rubble costume selection for the very best in unique or custom, handmade pieces from our shops. Dress features a faux leather collar with velcro fasten at rear. Then cut the bottom to make it raged looking.