'Undergarments' in the Bible

At that time the Lord announced through Isaiah son of Amoz: "Go, remove the sackcloth from your waist and take your sandals off your feet." He did as instructed and walked around in undergarments and barefoot.

Later the Lord explained, "In the same way that my servant Isaiah has walked around in undergarments and barefoot for the past three years, as an object lesson and omen pertaining to Egypt and Cush,

so the king of Assyria will lead away the captives of Egypt and the exiles of Cush, both young and old. They will be in undergarments and barefoot, with the buttocks exposed; the Egyptians will be publicly humiliated.