being a lady is tough, especially with things like this. i process lingerie at work and you're right, they really do jump in size 9/10 times. don't feel too bad tho, mine is hit and miss too cuz in store, they usually start D cups in a run of sizes at 36. merp. some ladies just don't ever get the luxury of shopping in stores. or swim two pieces that are sold as pairs but you can only fit top or bottom.
but hey... they're fun to jiggle and be weird with. so i guess we're winning there