Betty Grable in Sweet Rosie O'Grady (1943)
Worn by Madeleine 'Madge' Marlowe/Rosie O'Grady (Betty Grable) in Sweet Rosie O'Grady (1943)
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* Two options are not on the list, as they would probably take 80% or more of the votes between them - Princess Leia's bikini from Return of the Jedi and Loana's from One Million Years BC