The Collaborative International Dictionary of English v.0.48:

Caparison \Ca*par"i*son\, v. t. [imp. & p. p. Caparisonedp.
   pr. & vb. n. Caparisoning.] [Cf. F capara[,c]onner.]
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   1. To cover with housings, as a horse; to harness or fit out
      with decorative trappings, as a horse.
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            The steeds, caparisoned with purple, stand.
                                                  --Dryden.
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   2. To adorn with rich dress; to dress.
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            I am caparisoned like a man.          --Shak.
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