The Collaborative International Dictionary of English v.0.48:

Mae West \Mae West\ prop. n. [after Mae West (1892-1980) an
   actress with a well-developed bosom.]
   An inflatable life jacket, originally used as a personal
   flotation device by aviators downed at sea.

   Syn: air jacket.
        [WordNet 1.6] Maegbote

WordNet (r) 3.0 (2006):

Mae West
    n 1: United States film actress (1892-1980) [syn: West, Mae
         West]
    2: an inflatable life jacket [syn: Mae West, air jacket]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "Mae West":
   breeches buoy, buoy, cork jacket, ejection capsule, ejection seat,
   ejector seat, life belt, life buoy, life jacket, life net,
   life preserver, life raft, life ring, life vest, lifeboat,
   lifeline, parachute, rubber dinghy, safety belt, water wings