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How to stiffen leather
Soak the leather in cool water.
Fill a large bucket or sink with cool to room temperature water. Immerse the leather in the water for about 10 minutes, or until it becomes thoroughly soaked.

Options:
(A). Any hotter and the leather can lose some of its shine or become cracked. Churn the water to stiffness the leather..
(B). The hot water may loosen the fibers and, possibly, a discoloration. Adjust the temperature according to how dry or wet the leather is..
(C). Note that this process works best when used with vegetable tanned leather. You can technically stiffen the leather by soaking it in nothing but room temperature water, but it will only become mildly harder and you will not be able to shape it..
(D). You'll want the water to be as clean as possible, but beware: the water should not be too hot to put into the leather; too cold can cause stains, or even crack. When water drips off the leather while you're doing this, wet a clean cloth and wipe off as much of the moisture as possible..
(C).