(I bought a tape measure just for this)
I used my measurements and it was still too small. So whoever wrote the sizing charts didn't know what they were doing.
It was expensive and I can not even use it. Complete waste of time and money. I got a cheaper one from a different brand and they actually measured it correctly.
The funny thing is I am from Colombia and have an hourglass shape and it still didn't fit.
So disappointing.