Here is the size chart for selecting Zone3 wetsuits for women. These wetsuits are based on your chest, height, and weight when determining your correct size.
If you find yourself between two sizes, it's recommended to choose the size that aligns with most of the measurements, but generally, weight and chest measurements are the most crucial.
Ideally, a wetsuit should not fit too loosely. If there are many air pockets or 'bags' around the suit, it's too large for you.