Bible Verses About Sackcloth: By persons in affliction

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

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

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