Ladies, this is a MUST READ. Turns out I've been wearing the wrong bra size most of my life, and odds are you have, too! "Everything You Never Knew You Needed To Know About Bras" Seriously, I was off by 2 cup sizes... I am so much more comfortable!!!
How To Correctly Measure Your Breasts and Fit A Bra --- You need to realize that breasts have different shapes, and these shapes will effect how your breasts will look in different bras (and of course how you are fitted). -- Maybe this chart from Invest In Your Chest shows a better diagram of how breasts can come in many different shapes (these are just a few)