Shall be the girdle of his loins; it shall adorn him, and be the glory of his government, as a girdle was used for ornament, Isaiah 3:24, and as an ensign of power, Job 12:18; and it shall constantly cleave to him, in all his administrations, as a girdle cleaveth to a man's loins, which is the prophet's similitude, Jeremiah 13:11. The girdle of his reins; the same thing in other words.
Related Commentaries of Isaiah 11:5
Isaiah 11:5
5 And righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins.