The Collaborative International Dictionary of English v.0.48:

Silesia \Si*le"si*a\, n.
   1. A kind of linen cloth, originally made in Silesia, a
      province of Prussia.
      [1913 Webster]

   2. A twilled cotton fabric, used for dress linings.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Silesia
    n 1: a region of central Europe rich in deposits of coal and
         iron ore; annexed by Prussia in 1742 but now largely in
         Poland [syn: Silesia, Slask, Slezsko, Schlesien]
    2: a sturdy twill-weave cotton fabric; used for pockets and
       linings