Sackcloth /(?; 115)/

Sack·cloth

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.