Ditto what Mr. Sapergia says. You will want to get some 'veg tanned' leather in the 3-4 oz weight to start with. Also, try some from Tandy, at least for a couple of practice projects. Until you become proficient with your sewing by hand I would stay away from all the 'aniline dyed leather' as you may find they will 'bunch' up readily and you will not be happy with the result of all your effort. Just a thought.