The "Pear HeartGlass" fits B-C cup with a larger bottom size. Those who wear a small or medium on top and a medium and a large on bottom. This swimwear size is for those with larger rear ends whose bottoms tend to be too wide or too big in the front if they want a size that is true to fit their behind. 

Top: B-C cups

Waist: Smaller waist

Bottom: Larger bottom size