More opinions:
CLARKE:
He was naked - He was only in his vest. Γυμνος, naked, is often used to signify the absence of this upper garment only. In 1Sa 19:24, when Saul had put off his ἱματια, upper garments, he is said to have been γυμνος, naked; and David, when girded only with a linen ephod, is said to have been uncovered, in 2Sa 6:14, 2Sa 6:20. To which may be added what we read in the Sept.
Job 22:6, Thou hast taken away the covering of the naked; αμφιασιν γυμνων, the plaid or blanket in which they wrapped themselves, and besides which they had none other. In this sense it is that Virgil says, Geor. i. 299: Nudus ara, sere nudus, i.e. strip off your upper garments, and work till you sweat. See more examples in Bp. Pearce.
BARNES:
He was naked - He was undressed, with nothing on but the undergarment or tunic. The word does not require us to suppose a greater degree of nakedness than this. See the Mar 14:51 note; also 1Sa 19:24 note.