Please measure with a ruler around the bust/waist/hips and keep the ruler parallel to the ground.
Then find the closest size to your bust/waist/hips circumference in the size table below (the bust/waist/hips circumference values in the table point to your figure size, not the size of the shapewear).
The measurements of swimsuit model: Bust ( 40.2″ ), waist ( 30.7″ ), hips ( 47.2″ ), size: L ( dress size: 18 )