Bible Verses About Sackcloth: By persons in affliction

Now in the twenty and fourth day of this month the children of Israel were assembled with fasting, and with sackcloth, and earth upon them.

When I made sackcloth my clothing, I became a byword unto them.

And the people of Nineveh believed God; and they proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them.