Help dating a vintage slip

This part of the label resource entry leads me to believe it would be from within that time frame:
"In 1946 Heim started his own chain of sportswear boutiques. He was one of the early designers of the bikini, called the Atome, and he was known for his beachwear. In the same year Heim visited the United States in order to establish contracts with several US department stores for which he was to design collections." The reason I say nightgown, is the level of lacy frilliness, and the cap sleeve. For a slip, I'd expect straps.
 
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