If a style does not fit you perfectly, you should consider cross sizing. (Not suitable for every body, depends on the breast and the shape.)
Cross sizing can differ depending on your body type.
If you have a larger under bust section, size up the band and reduce the cup size. If you have a fuller bust, size up the cup size, but reduce the band size.
Example: If you wear a size 42D, but have a larger under bust section, the best cross-size would be size 44C. If you are fuller in the bust and not so large in the under bust, the best cross-size would be 40DD."