The Collaborative International Dictionary of English v.0.48:

Deerstalker \Deer"stalk`er\, n.
   1. One who practices deerstalking.
      [1913 Webster]

   2. A close-fitting cap, usually woolen, such as is worn in
      deerstalking, having a low crown and visors both in front
      and back, and having earflaps which are usually worn tied
      together over the top; also called fore-and-after,
      deerstalker hat and deerstalker cap; a hunter's cap;
      formerly also used for any stiff, round hat. [Eng.]
      [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

fore-and-after
    n 1: sailing vessel with a fore-and-aft rig