Put 5 leather strips in an X pattern to make a piece of leather.
Wool 1
Wool 0
Wool 9
Wool 4
Wool 5
Wool 15
Wool 13
Wool 7
Wool 12
Wool 3
Cook a zombie flesh to make a leather strip.
Wool 10
Wool 2
Crafting wool
Wool 11
Wool 6
Wool 8
Wool 14