On July 5, 1946, the bikini, created by Louis Reard, was modeled by Micheline Bernadini during a poolside fashion show in Paris.
Vive La France!

And here she is.....
see, I really am 19.
Its design was thought to be so risqué that no reputable model would wear it for a photo shoot, let alone a debut to the world. Instead, a former nude dancer working the Casino de Paris, a 19-year-old French woman named Micheline Bernardin, agreed to model the swimsuit.
“A bikini is not a bikini unless it can be pulled through a wedding ring.” – Louis Reard, Creator of the bikini
I'm not really sure where the line is, but once you go about 250lbs, you should really rethink the bikini idea.