'Robes' in the Bible

Now the king of Israel and Jehoshaphat the king of Judah sat each on his throne, arrayed in their robes, and they were sitting in an open place at the entrance of the gate of Samaria; and all the prophets were prophesying before them.

And the king of Israel said unto Jehoshaphat, I will disguise myself, and go into the battle; but put thou on thy robes. So the king of Israel disguised himself; and they went into the battle.