Genesis 37:34

Verse 34. Sack-cloth, or hair-cloth, cilicio. These garments were made very close, like a sack, of the hair taken from the goats of Cilicia, which grew long, rough, and of a dark colour. The poorest people used them: Usum in Castrorum & miseris velamina nautis, (Virg. Geor. 3.); and the Ascetics, or monks, afterwards chose them for the sake of mortification and humility. Calmet.—Jacob was the first, mentioned in Scripture, who put them on, and the Israelites imitated him in their mourning.—Long time; twenty-three years, till he heard of his son being still alive. Menochius.