I'm a size 16, I am pretty much a size 16 in all shops sizing although on a good day could prob get into a 14 in M+S. I hate trying things on in shops and generally dont need to so bought a very lovely Monsoon dress and it firs perfectly other than in the chest area, it absolutely squashes them flat and in a bad bad way as if someone was holding an invisible board up against them so I have cleavage but the rest is squished downwards. WTF???? I'm a 36DD and dont have this issue with anything else from anywhere else.