The Collaborative International Dictionary of English v.0.48:
Challis \Chal"lis\, n. [F. chaly, challis, a stuff made of goat's hair.] A soft and delicate woolen, or woolen and silk, fabric, for ladies' dresses. [Written also chally.] [1913 Webster]WordNet (r) 3.0 (2006):
challis n 1: a soft lightweight fabric (usually printed)