Bottom coverage varies greatly, and can work to flatter most anyone. Fabrics vary too with many prints and colors that work to slim, conceal, or accentuate as much as you desire. I take really good care of my suits and they still wear out so fast and lose their shape. Actually, you are probably being too careful, and that's the problem. One of the most common mistakes is in the after wear care .
Many girls carefully rinse in cold water and use a very mild soap.
Ideally, after a day at the pool or beach, wear the suit into the shower and wash thoroughly with a bar soap like ivory. Another option is machine washing but it must be protected in a mesh garment bag. Always flat dry out of direct sunlight, never machine dry. While this technique may cause some fading, the wearability of the suit will be extended greatly. Here's a great trick that is a well kept secret.