Using rawhide as an insert for fast draw holster?

[Bustedmp77]

I have a friend of mine that wants a fast draw rig. The holster and belt are no problem the way I normally make them, but he wants the holster to have rawhide used between the two layers of leather to keep it nice and loose for his gun. I'm not beyond giving it a shot and figured I'd try it on scraps first, but would like an idea how to start it out. Do I shape and dry the rawhide, then assemble the holster? I thought about using kydex as an insert instead.