Revisting this old post. I gave up on the project because of being unsure how to proceed but I am going to give it another try.
I am think the material is about 1mm which is between the thickness of 2 oz and 3 oz leather. I am going to order and try line 16 (and/or line 16 segma belt) snaps with an 1/8" post but I am still open to advice. I tried glove snaps but there was too much post pounded over in the socket to accept the stud part of the snap. When I first posted this I followed the suggestion that I look for canvas snaps and I do see a lot of places selling what looks like line 20 and 24 snaps for canvas.
What I am asking is -- has anyone used leather snaps (line 16, 20, 24, glove, belt, what ever) on fabric, canvas or vinyl? If so, and you got good results it might mean that my tool/fastening technique is all wrong and not the snaps.