Thank you for this pattern. I made one out of some lightweight (1mm) embossed leather that I got out of the scrap bin at Springfield Leather. I really like how it turned out. I may make another one with the outside increased to 3.25" and the stitching continued all the way around.
I've ordered from studsandspikes.com before. Huge selection, much larger than your typical leather supply, but no stainless. Nickel over brass I believe.