Serge (?), n. [F. serge, sarge, originally, a silken stuff, fr. L. serica, f. or neut. pl. of sericus silken. See Sericeous, Silk.] A woolen twilled stuff, much used as material for clothing for both sexes.
[1913 Webster]

Silk serge, a twilled silk fabric used mostly by tailors for lining parts of gentlemen's coats.
[1913 Webster]