First we need to find 8 Totem of Undying.
We can combine these totems with chestplate.
If we die while wearing this armor, the totem will activate and cancel death. Since we use 8 totems while making the armor, it can be used 8 times.
The name of the armor and the number on its back will change with each use. so we can see how many uses are left.
Also, while we have totems in chestplate, its durability does not decrease but When the totems on it are finished, it remains as the classic Diamond Chestplate and durability starts to decrease.