'Robes' in the Bible

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

The king of Israel said to Jehoshaphat, "I will disguise myself, and go into the battle; but you put on your robes." The king of Israel disguised himself, and went into the battle.