Just forget about black short dresses for a while. Now you should wear a nightie dress.
At the center of attention are the dresses that resemble night wear. Silky overalls are trendy a few seasons already.
Designers suggest to wear it with trousers. It can also be done in the same way as Kim Bessinger did in the film 7 and a half weeks on a naked body.
The probability of being mistaken in this case is great, so if you are unsure, do not risk it.