Haircloth

Haircloth -- A cloth woven of horse hair, from which it takes its name, for weft with cotton or linen warp; used for facings, linings, furniture cover, etc.

Textiles and Clothing Kate Heintz Watson

Haircloth, Fasting and Discipline, to take from the flesh the roots of sin; but when the Soul enters into the way of the Spirit, imbracing internal mortification, corporal chastisements ought to be relaxed, because there is trouble enough in the Spirit: the heart is weakned, the breast suffers, the brain is weary, the whole Body grieved and disabled for the functions of the

The spiritual guide which disentangles the soul / by Michael de Molinos ; edited with an introduction by Kathleen Lyttelton and a note by H. Scott Holland. 1907