1942. It’s possible that this photo is from the same sitting as the series of three by Clarence Sinclair Bull on aenigma. They also feature Hedy in diaphanous chiffon and share the same caption, which reads:
UNIQUE CHARM…of Hedy Lamarr is revealed in this new portrait of the Metro-Goldwyn-Mayer star. Miss Lamarr has shown her versatility as an actress in her varied roles, first as the fiery “Dolores” in “Tortilla Flat” followed by that of a French gentlewoman in “Crossroads,” and soon to be seen as the seductive native girl “Tondeleyo” in “White Cargo.”