The Collaborative International Dictionary of English v.0.48:
Grogram \Grog"ram\, Grogran \Grog"ran\, n. [OF. gros-grain, lit., gros-grain, of a coarse texture. See Gross, and Grain a kernel, and cf. Grog.] A coarse stuff made of silk and mohair, or of coarse silk. [1913 Webster]WordNet (r) 3.0 (2006):
grogram n 1: a coarse fabric of silk mixed with wool or mohair and often stiffened with gum