'Haircloth' in the Bible

Unhappy are you, Chorazin! Unhappy are you, Beth-saida! For if the works of power which were done in you had been done in Tyre and Sidon, they would have been turned from their sins in days gone by, clothing themselves in haircloth and putting dust on their heads.

And I saw when the sixth stamp was undone, and there was a great earth-shock; and the sun became black as haircloth, and all the moon became as blood;

And I will give orders to my two witnesses, and they will be prophets for a thousand, two hundred and sixty days, clothed with haircloth.