Leather is harvested by killing cows.
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You kill cows for it, and they either drop food, or leather. You can't make leather out of anything else, you have to get it.
Three leather
L= Leather N=Nothing NNN LNL LNL
minecraft wiki it 1-4) Leather armour, there are 4 pieces
Leather helmets give you armor and is weaker than gold armor :D