SACK

SACK. A loose garment — a word still in use. There was an ancient fraternity called 'fratres saccati,' or sac-friars, from the coarse sackcloth garment which they wore. "Et eodem tempore (1257) novus ordo apparuit Londiui, qui, quia saccis incedebant iuduti, Fratres Saccati vocabantur." Matthew Paris. See Archajologia, iii. 121).

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.