Ball Costume Diy . Disco ball costume for halloween forkids. You’ll use the bottom half for this hat. DIY Palm Tree + Beach Ball Costumes Studio DIY from studiodiy.com Apply a fourth layer of papier mache atop the masking tape. Grab 4 of you cover buttons and glue the backs onto 2 of the buttons. So, you want to make sure that the elastic isn’t too tight on your stomach when you sit down!