The Collaborative International Dictionary of English v.0.48:
hopsacking \hopsacking\ n. a loosely woven coarse fabric of cotton or linen, used in clothing. Syn: hopsack. [WordNet 1.5]WordNet (r) 3.0 (2006):
hopsacking n 1: a loosely woven coarse fabric of cotton or linen; used in clothing [syn: hopsacking, hopsack]