I was talking to my Crow Indian uncle about teepees, and I asked him why they switched from buffalo hide to canvas. He said that the hide ones lasted much longer than canvas, but were heavier and took a lot more work to make. Every couple of years, you would have to cut the bottom few feet off and sew on fresh hide, as the bottom tends to rot and wear out faster from dew, snow, tension from the stakes, etc. They would use the cut-off portion to make bags, leggings, and other items that need soft leather. I asked him if they made shoes out of it, and he said no, that they used leather from the tops of the teepee for that, when a whole teepee cover was scrapped. The upper sections would be almost black, seasoned from the small fires that warmed the teepee's interior. The smoked buffalo hide in one or two layers made an excellent moccasin sole, long-wearing and nearly waterproof. The sinew used to sew them would also swell when wet, working to seal the needle holes.
My grandma added that if an Indian girl went around with too many boys and did bad things, they would say, "Look at dat girl over derr... she's got a hole in her moccasin."