The Collaborative International Dictionary of English v.0.48:

maillot \maillot\ n.
   A woman's one-piece bathing suit.

   Syn: tank suit.
        [WordNet 1.5]

   2. for dancers or gymnasts.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

maillot
    n 1: a woman's one-piece bathing suit [syn: maillot, tank
         suit]
    2: tights for dancers or gymnasts