The Collaborative International Dictionary of English v.0.48:

Poplin \Pop"lin\, n. [F. popeline, papeline.]
   A fabric of many varieties, usually made of silk and worsted,
   -- used especially for women's dresses.
   [1913 Webster]

   Irish poplin, a fabric with silk warp and worsted weft,
      made in Ireland.
      [1913 Webster]

WordNet (r) 3.0 (2006):

poplin
    n 1: a ribbed fabric used in clothing and upholstery