If anyone is interested, and I'd fully expect you not to be because I am a leatherwork nerd, my items are made from vegetable-tanned leather that is all hand-sewn using the traditional, twin needle method. No rivets are ever used, as they concentrate stress in one area, whereas stitching spreads it over a large surface. Saddlery always uses stitching, because the thought of perhaps four horses breaking free because of a failed rivet doesn't bear contemplating.
Traditional, twin needle stitching allows for one line of thread to break without the seam coming unravelled, as machine sewing does. I know that Subs are weaker than horses, but you can never be too careful in a BDSM scene. Hand stitching takes ages compared with either rivetting, or machine sewing, but the results are aesthetically much more pleasing and infinitely more durable.
All my collars are finished with bevelled, burnished edges, unlike the mass-produced dross with which the market is saturated. If you'd like to know more about collars and harnesses for BDSM play, then please message me.