'Mail' in the Bible

“The deep [water] covers them;[Clad in armor] they sank into the depths like a stone.

“You blew with Your wind, the sea covered them;[Clad in armor] they sank like lead in the mighty waters.

There is to be an opening at its top, in the middle, with a woven binding around the opening like the opening of a coat of mail so that it cannot be torn.

The opening of the robe was in the middle, like the opening of a coat of mail, with a binding around the opening so it would not be torn.