Sackcloth. Cloth used in making sacks or bags, a coarse fabric, of a dark color, made of goat's hair, Isaiah 50:3; Revelation 6:12, and resembling the eilicium of the Romans. It was used also for making the rough garments used by mourners, which were, in extreme cases, worn next the skin. 1 Kings 21:27; 2 Kings 6:30; Job 16:15; Isaiah 32:11.