Another option beside the leather and nylon webbing, is to use those vinyl wall baseboard that you can get at Home Depot or Lowes.
They come in a 4 foot lenght and white in color and can be easily cut with utility knife. They are durable and flexible. You can rivet it, snap or velcro to the plates.
Also you can use this as the back part of your armor belt. Trim it to size and wrap it with canvas or duck cloth. They are sturdy enough to hang your holster versus those layers of canvas belt.