And if the nuclear bomb were a code for blackmail, this Wikipedia article also makes a lot of sense.

In May 1946, Parisian fashion designer Jacques Heim released a two-piece swimsuit design that he named the Atome ('Atom') and advertised as "the smallest swimsuit in the world".[4] Like swimsuits of the era, it covered the wearer's belly button, and it failed to attract much attention. Clothing designer Louis Réard introduced his new, smaller design in July.[5] He named the swimsuit after the Bikini Atoll, where the first public test of a nuclear bomb had taken place four days before. His skimpy design was risqué, exposing the wearer's navel and much of her buttocks. No runway model would wear it, so he hired a nude dancer from the Casino de Paris named Micheline Bernardini to model it at a review of swimsuit fashions.[6]

https://en.m.wikipedia.org/wiki/Bikini#:~:text=French%20automotive%20engineer%20Louis%20R%C3%A9ard,name%20for%20the%20island%2C%20Pikinni.