Thematic Bible: Symbolically wearing sackcloth and going barefoot

Then spake the LORD unto Isaiah the son of Amoz, saying, "Go, and loose off that sackcloth from thy loins, and put off thy shoes from thy feet." And so he did, going naked and barefoot. Then said the LORD, "Whereas my servant Isaiah goeth naked and barefoot, it is a token and signifying of the thing that after three years shall come upon Egypt and Ethiopia.