I just read Joanofsarcasm's notepad, and wow, my current bras are really off! +
I usually wear a 34B, because that was the only size that I found sort of fit, but after using her guide, I'm either a 30D, 30DD, or 28F! (I can't find just the right size, because I get different results when I measure in cm versus inches, and when I stand up versus when my back is parallel to the ground.)
Just ordered some 30D bras from ASOS to try, so hopefully it fits well! If you had yourself measured, could you share what you thought your size was, and what it actually is? And when you got the new bra, did it really fit you better? It's hard to believe I'm a D cup, plus it's IMPOSSIBLE to buy any 30 inch bands here in Singapore.