Can't you just make one? First get the size & shape in cardboard, then transfer to plastic. To get a 3 dimensional thickness, use bondo or epoxy putty. For texture, delaminate a Kleenex, coat the part w/ liquid cement, and lay the tissue down on it, working it down. Wire or pinheads could represent the snaps.
An alternative of the above, is to use it as a mold, and vacuform copies.