A halter style gown, which Marilyn had custom made for the film. This
costume is based on a design by women’s clothier Jax. Marilyn had four
personal dresses in this same style in red, orange, gray and white. This
particular film costume varies from her personal dresses in that the skirt
is floor length. Her personal gowns were knee-length.
Shown below is a rare image of Marilyn on the set of "Let's Make Love"
wearing this gown.