Leather

Leather is a versatile crafting material.

Drops from animals
Cows, mooshrooms, horses, donkeys, mules and llamas drop 0-2 pieces of leather upon death.

Fishing
Leather can be obtained as a "junk" item from fishing.

Trading
Leatherworker villagers will buy 9-12 leather for an emerald.

Repairing
Leather armor and elytra can be repaired with leather in an anvil.

Issues
Kůže Leder Cuero Cuir Bőr Cuoio 革 가죽 Leer Skóra pt-br:Couro Кожа 皮革