I was commissioned to make a Flashpoint Batman utility belt complete with gun holsters. I patterned the pouches, holsters, and buckle and put together a strap system of webbing for the holsters. I used chicago screws and washers to attach the holsters and pouches and then glued the webbing to the foam belt. It fastens at the back with a plastic buckle. The webbing and plastic hardware are from strapworks.com.
The template for the belt is available here.