Matthew 3:4

Now this John had his garment made of camel's hair, and a girdle of leather about his loins, and his food was locusts and wild honey.

Matthew 16:24

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

John 21:7

Then said that disciple whom Jesus loved to Peter, It is the Lord! Then Simon Peter, when he heard that it was the Lord, girt his coat round him, (for he was stripped,) and threw himself into the sea.

Acts 19:16

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

Revelation 11:3

And I will give charge to my two witnesses, and they shall prophesy a thousand two 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
Now this John had his garment made of camel's hair, and a girdle of leather about his loins, and his food was locusts and wild honey.
Revelation 11:3
And I will give charge to my two witnesses, and they shall prophesy a thousand two hundred and sixty days, clothed in sackcloth.

Naked

John 21:7
Then said that disciple whom Jesus loved to Peter, It is the Lord! Then Simon Peter, when he heard that it was the Lord, girt his coat round him, (for he was stripped,) and threw himself into the sea.
Acts 19:16
And the man sprang upon them, in whom was the evil spirit, and getting the mastery over them, prevailed against them, so that they fled out of that house naked and wounded.