[1] : The Collaborative International Dictionary of English v.0.48

sans-culotte \sans`-cu`lotte"\ f. ?; e. ?, n. f., without
   breeches.
   1. a fellow without breeches; a ragged fellow; -- a name of
      reproach given in the first french revolution to the
      extreme republican party, who rejected breeches as an
      emblem peculiar to the upper classes or aristocracy, and
      adopted pantaloons.
      1913 webster

   2. hence, an extreme or radical republican; a violent
      revolutionist; a jacobin.
      1913 webster

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Sansculotte, definition of term: Sansculotte
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