sur·coat /ˈsɝˌkot/
  外套;婦女穿的外衣
  Sur·coat n.
  1. A coat worn over the other garments; especially, the long and flowing garment of knights, worn over the armor, and frequently emblazoned with the arms of the wearer.
     A long surcoat of pers upon he had..   --Chaucer.
  At night, or in the rain,
  He dons a surcoat which he doffs at morn.   --Emerson.
  2. A name given to the outer garment of either sex at different epochs of the Middle Ages.
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  surcoat
       n 1: a loose outer coat usually of rich material
       2: a tunic worn over a knight's armor