Source : Webster's Revised Unabridged Dictionary (1913)

Guimpe \Guimpe\, n. [F. See 2d {Gimp}.]
   A kind of short chemisette, worn with a low-necked dress.

Source : WordNet®

guimpe
     n 1: a piece of starched cloth covering the shoulders of a nun's
          habit
     2: a short blouse with sleeves that is worn under a jumper or
        pinafore dress