A flotation vest kept handy especially by navy pilots in WW II in case the need to ditch into the ocean arose. Named in honour of the uberboobed actress.

(n)A parachuting malfunction more officially called a lineover, in which a line crosses over the top of the parachute, dividing the canopy into two parts. The result resembles a giant bra; hence the reference to the well-endowed late actress.

1. a early inflatable life preserver

2. a parachute malfunction that divides the cloth so that it resemble an exaggerated brassiere .

(First sense partly from the resemblance to A well endowed American actress who was then appearing in films)