The Collaborative International Dictionary of English v.0.48:

Chopine \Cho*pine"\, n. [Cf. OF. chapin, escapin, Sp. chapin,
   Pg. chapim.]
   A clog, or patten, having a very thick sole, or in some cases
   raised upon a stilt to a height of a foot or more. [Variously
   spelt chioppine, chopin, etc.]
   [1913 Webster]

         Your ladyship is nearer to heaven than when I saw you
         last, by the altitude of a chopine.      --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chopine
    n 1: a woman's shoe with a very high thick sole [syn: chopine,
         platform]