Few people know more than the day’s most basic details, primarily the dress and the scandal.

And Monroe definitely wasn’t sporting any SKIMS shapewear underneath.

Reportedly, the skintight marquisette dress didn’t allow her to wear anything but the gown itself.

How did the dress come to be?

The dress was eye-popping, to be sure, especially for the nature of the event.

Marilyn Monroe sang happy birthday to President JFK at a fundraiser for him and the Democratic National Committee.

Monroe ordered a custom gown by French fashion designer Jean Louis for the occasion.

Not to mention getting everyone talking.

Monroe can be seen wearing the figure-hugging dress responsible for so much gossip.

One could say that Monroe pioneered the barely-there dress.