Bra Fit Mathematics

Drastic changes in cup size can come as a shock after a proper bra fitting. When you understand the math behind the measurements, it's much easier to accept.

Cups and Measures shared a clear and informative description she found on reddit in her blog.
http://cupsandmeasures.wordpress.com/2012/06/12/reddit-to-the-rescue-8/

"The letter is a measurement of the difference between the whole boob measurement and the around the ribcage under the boob measurement. So as the number (ribcage measurement) gets smaller, the same sized “boob measurement” gets larger, as the difference would be growing, giving you a higher cup size.So in this case, she thought she was 34C and found out that she was actually 32E, right? Her “boob measurement” (presumably 37″) is the exact same it was, meaning her boobs are actually no different, but the “ribcage measurement” is two inches less than she thought it was (she thought it was 34, but it was actually 32). This means that the difference between the two is actually 5″ different instead of 3″ which, according to the chart given to us by mywifesbusty, changes her assumed cup size from C to her actual cup size of E.The easiest way I can think of this is imagine huge boobs on a small woman. Then imagine the exact same boobs on a larger woman. The boobs seem to be more noticeably large on the little woman, giving her a bigger cup size out of the deal."

Bra Bulge - Too Tight?

We all hate the unsightly back bulge caused by bras that don't fit quite right. Think it's because it fits too snugly? That's likely not the case.
Read Is My Bra Too Tight? on RealSimple.com.

Q: I always look like I have back fat. Is my bra too tight?

 A: No, it’s actually too loose. A properly fitting bra is the key to a smooth back. Here are three strategies to prevent bra-induced bulge:
 
Make sure the band fits snugly (you should be able to slide only one finger underneath it) and sits low under your shoulder blades. “When the band is too large, the bra rides up in the back, which creates a roll,” says Lauren Amerine, a co-owner of Isabella Fine Lingerie, in Chicago. (Remember: The band should fit perfectly on the loosest hook, since the bra will inevitably stretch out.)
 
Look for a bra with a band that is wide under the arms and across the back to help hold in soft flesh (the closure should have a row of two or three hooks, not one hook).

http://www.realsimple.com/beauty-fashion/shoes-accessories/lingerie-hosiery/is-my-bra-too-tight-00000000026508/index.html