Sackcloth

n.

1.

Linen or cotton cloth such as sacks are made of; coarse cloth; anciently, a cloth or garment worn in mourning, distress, mortification, or penitence. Gird you with sackcloth, and mourn before Abner. - 2 Sam. iii. 31. Thus with sackcloth I invest my woe. - Sandys.

Noun	1.	sackcloth - a garment made of coarse sacking; formerly worn as an indication of remorse
	2.	sackcloth - a coarse cloth resembling sacking

garment