The Collaborative International Dictionary of English v.0.48:

Stovepipe \Stove"pipe`\ (st[=o]v"p[imac]p`), n.
   Pipe made of sheet iron in length and angular or curved
   pieces fitting together, -- used to connect a portable stove
   with a chimney flue.
   [1913 Webster]

   Stovepipe hat, A tall silk hat with a brim, worn commonly
      as an item of formal dress by gentlemen in the late
      1800's. [Slang, U.S.]
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

stovepipe
    n 1: chimney consisting of a metal pipe of large diameter that
         is used to connect a stove to a flue
    2: a man's hat with a tall crown; usually covered with silk or
       with beaver fur [syn: dress hat, high hat, opera hat,
       silk hat, stovepipe, top hat, topper, beaver]