At the same time spoke the LORD by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off your loins…
Owing to the great importance which is attributed to clothing from the standpoint of Oriental culture and manners, anyone who appears without the upper garment is already regarded as naked and bare. Isaiah has to lay off the garment of the preacher of repentance and of the mourner, so that only his tunic remains; and in this dress, and moreover barefooted, he has to appear in public. It is the costume of a man who had been robbed and disgraced, of a beggar, it may be, or a prisoner of war.
Parallel VersesKJV: At the same time spake the LORD by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot.