Naked

Concise Bible Dictionary:

An expression which, besides its ordinary signification, was often used when a man was without his outside mantle or cloak (1 Sam. 19:2424And he stripped off his clothes also, and prophesied before Samuel in like manner, and lay down naked all that day and all that night. Wherefore they say, Is Saul also among the prophets? (1 Samuel 19:24); Isa. 20:22At the same time spake the Lord by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot. (Isaiah 20:2); John 21:77Therefore that disciple whom Jesus loved saith unto Peter, It is the Lord. Now when Simon Peter heard that it was the Lord, he girt his fisher's coat unto him, (for he was naked,) and did cast himself into the sea. (John 21:7)). It is used symbolically for natural destitution (James 2:1515If a brother or sister be naked, and destitute of daily food, (James 2:15)); for spiritual destitution (2 Cor. 5:33If so be that being clothed we shall not be found naked. (2 Corinthians 5:3); Rev. 3:1717Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked: (Revelation 3:17); Rev. 16:1515Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame. (Revelation 16:15)); and for spoliation (Rev. 17:1616And the ten horns which thou sawest upon the beast, these shall hate the whore, and shall make her desolate and naked, and shall eat her flesh, and burn her with fire. (Revelation 17:16)).

From Manners and Customs of the Bible:

This does not mean absolutely without any clothing. A person was called naked whose outer garments were thrown aside, leaving nothing but the tunic and girdle. See note on John 19:2323Then the soldiers, when they had crucified Jesus, took his garments, and made four parts, to every soldier a part; and also his coat: now the coat was without seam, woven from the top throughout. (John 19:23) (#821). Thus Isaiah was naked by simply removing his sackcloth mantle (Isa. 20:22At the same time spake the Lord by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot. (Isaiah 20:2)). This is also the meaning of “flee away naked” in Amos 2:1616And he that is courageous among the mighty shall flee away naked in that day, saith the Lord. (Amos 2:16). The young man who followed Jesus at the time of his arrest was probably “naked” in this sense (Mark 14:51-5251And there followed him a certain young man, having a linen cloth cast about his naked body; and the young men laid hold on him: 52And he left the linen cloth, and fled from them naked. (Mark 14:51‑52)). Peter was also “naked” in the same way at the time he cast himself into the sea to meet the Lord (John 21:77Therefore that disciple whom Jesus loved saith unto Peter, It is the Lord. Now when Simon Peter heard that it was the Lord, he girt his fisher's coat unto him, (for he was naked,) and did cast himself into the sea. (John 21:7)). Compare 2 Samuel 6:14,2014And David danced before the Lord with all his might; and David was girded with a linen ephod. (2 Samuel 6:14)
20Then David returned to bless his household. And Michal the daughter of Saul came out to meet David, and said, How glorious was the king of Israel to day, who uncovered himself to day in the eyes of the handmaids of his servants, as one of the vain fellows shamelessly uncovereth himself! (2 Samuel 6:20)
.