{i} coarse fabric used to make sacks; garment made from coarse fabric and worn as a sign of mourning or repentance
If you talk about sackcloth or sackcloth and ashes you are referring to an exaggerated attempt by someone to show that they are sorry for doing something wrong
Linen or cotton cloth such as sacks are made of; coarse cloth; anciently, a cloth or garment worn in mourning, distress, mortification, or penitence
Sackcloth is rough woven material that is used to make sacks. He kept the club wrapped in sackcloth. = hessian
a coarse cloth resembling sacking a garment made of coarse sacking; formerly worn as an indication of remorse