|Hide + Wool + Iron Ingots|
The main use for an elephant harness is to make elephants and mammoths rideable, and so that extra items can be added to them, such as an elephant howdah, elephant garment (an item exclusive for Asian elephants), mammoth platform (for Songhua River mammoths) and an elephant chest.
An elephant harness can be applied by right-clicking on a tamed adult elephant or mammoth. It can be removed by right-clicking on the elephant or mammoth with shears, placing the elephant/mammoth in a pet amulet, when it is killed, or when a scroll of freedom is used. If you 'sneak' near your elephant (shift key by default) or mammoth, it will sit for a short time, allowing you to sit on the harness by right-clicking on it.