Matthew 3:4

And this John had his raiment of camels hair, and a leathern girdle about his loins; and his food was locusts and wild honey.

Matthew 16:24

Then said Jesus to his disciples, If any man be willing to come after me, let him deny himself, and take up his cross and follow me.

John 21:7

Then the disciple whom Jesus loved saith to Peter, It is the Lord. Simon Peter hearing that it was the Lord, girt on his upper coat (for he was stript) and threw himself into the sea.

Acts 19:16

And the man in whom the evil spirit was, leaping upon them, and getting the mastery of them, prevailed against them, so that they fled out of that house naked and wounded.

Revelation 11:3

And I will give to my two witnesses to prophesy twelve hundred and sixty days, clothed in sackcloth.

Treasury of Scripture Knowledge

Summary

At 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.

Bible References

The sackcloth

Matthew 3:4
And this John had his raiment of camels hair, and a leathern girdle about his loins; and his food was locusts and wild honey.
Revelation 11:3
And I will give to my two witnesses to prophesy twelve hundred and sixty days, clothed in sackcloth.

Naked

John 21:7
Then the disciple whom Jesus loved saith to Peter, It is the Lord. Simon Peter hearing that it was the Lord, girt on his upper coat (for he was stript) and threw himself into the sea.
Acts 19:16
And the man in whom the evil spirit was, leaping upon them, and getting the mastery of them, prevailed against them, so that they fled out of that house naked and wounded.