Isaiah 20:2

"At that time Jehovah spake by Isaiah the son of Amoz, saying, Go, and loose the sackcloth from off thy loins, and put thy shoe from off thy foot. And he did so, walking naked and barefoot."

"Sackcloth was regarded as the appropriate dress for prophets; it was made of the coarse hair of the goat."[5] As for the instruction here to walk naked and barefoot, it is a mistake to think that Isaiah was totally nude. Hailey's quotation from Delitzsch has this: "What Isaiah was directed to do was simply opposed to common custom, not to moral decency."[6] No doubt, he actually wore a loin cloth or some other very abbreviated garment. This instead of the prophet's customary dress was sensational enough. It is amazing that very respected commentators will flatly contradict the Word of God on a matter of this kind. Barnes pointed out that men consider it beneath the dignity of the royal prophet to have gone so long without his clothes. Lowth suggested that he walked naked and barefoot only for three days, which stood for three years![7] "Rosemuller supposed this to mean `only at intervals' for three years."[8] To all such objections and suggestions, there remains the solid answer of the text: "And he did so, walking naked and barefoot."