this doesnt really relate to miracle suit swimwear, as i haven't had any personal experience with it.
I can tell you though, that some brands are bigger sizes than other brands. I can tell you though that the stick on silicone bras that are bought from lingerie shops, it is recommended to go a cup larger than what you are....i have had experience with this and it does seem to be true! i know if i bought a C- cup i wouldn't have been as supported as what i was with a D cup!
Hope someone can help you
Cheers.