Source : Webster's Revised Unabridged Dictionary (1913)

Broadcloth \Broad"cloth\, n.
   A fine smooth-faced woolen cloth for men's garments, usually
   of double width (i.e., a yard and a half); -- so called in
   distinction from woolens three quarters of a yard wide.

Source : WordNet®

broadcloth
     n 1: a densely textured woolen fabric with a lustrous finish
     2: a closely woven silk or synthetic fabric with a narrow
        crosswise rib