Based on the limited screen shots of the holster, I attached mine to the ammo belt. It slides perfectly over it, and seems to hang to the side of the leg correctly. One problem I had with the belt when I did this was the weight caused the belt to sag down. I fixed this by simply cutting a piece of abs and velcroing it to the inside of the belt where the holster hangs from.
Someone had posted a great screen shot awhile back that showed ESB Boba full body from the back. I believe it was a Kenner image they used to make the action figure. I can't find it now, or I would post it, so if anyone has this image could you post here? It really is a great pic to refer to.