An upper garment or blouse. Only here in the New Testament. In the Septuagint, 1Sa 18:4, the robe which Jonathan gave to David. 2Sa 13:18, the royal virgin garment of Tamar. The kindred verb, ἐπενδύομαι, occurs twice (2Co 5:2, 2Co 5:4), meaning “to be clothed upon,” with the house which is from heaven, i.e., clothed as with an upper garment. See on that passage.
Naked
Not absolutely, but clothed merely in his undergarment or shirt.