There is an outstanding shop in Paris where you can buy leather ( pieces or full skin) and you can thin them the thickness you want. Thickness is the key especially for the liner (0.6 is perfect).
The naturally ( or vegetally) tanned leather are the only one to use because first, for the skin, it will avoid any reaction and secondly this is the only type of the leather you can 'trace' on. Minerally tanned leather or chromed leather are not good because you can't even trace the line on it or you need a very expensive tool ( like a steel Knive heaten called ' for a filer').
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