c. 1935 JH3H10
Maillot and cape.
TL. Cleavage côté.
Harlow leans against a pole (1). The same picture, reversed and cropped, and used in a magazine after her death (2).
This too advances the silhouette of the fitted increasingly backless maillot.
Just what the straps might be--even if they exist--is eluded from view by the cape.
Many sources including flickr.com and ebay.com. Date is estimation. 2 pictures.