A part of the defensive armor of a soldier
And there shall be an hole in the top of it, in the midst thereof: it shall have a binding of woven work round about the hole of it, as it were the hole of an habergeon, that it be not rent. (Exodus 28:32)
And there was an hole in the midst of the robe, as the hole of an habergeon, with a band round about the hole, that it should not rend. (Exodus 39:23)
See BREASTPLATE