[MissC]

Hopefully that should take me from a 42aa to a 40A bra size.

Not sure what you were intending here, but those two sizes are exactly the same in cup volume. Losing weight, of course, will bring your band size down... but I'm thinking you've got your sights aimed a bit higher than that!

I put up a thread a while ago explaining the vagaries of bra sizing:

http://breastnexus.com/showthread.php?tid=16067

So, if indeed you are a 42AA -- which is possible, but some 80% of women are in the wrong size bra -- then it's a 40B you'll be wanting to shoot for; that's the increase in volume.

Yeah, it's confusing.