There's the grained bolster pattern, the textured insert (seating surface) pattern, and the ribbed pattern along the top of the backrest, which is bordered with a silver foil piping. The rest of the piping is in color.
Here's a pic of my '64 Savoy; seats are dead-on correct vinyl.
SMS is in Portland, OR and sells upholstery material, as does Original Auto Interiors in MI.