Research has determined that up to 80% of women are wearing the wrong bra size.  I think women with implants are better at fitting bras then the general public but it has been many years since you have had to figure out your bra size.  In addition, for those of us that are bigger than a D cup, we continually look to online shops to buy our bras and understanding how to measure is key.

The good folks over at Her Room have created a guide to bra fitting:
Bra fitting guide at HerRoom.com

While I think we are fanatics about our cup size (who doesn’t love seeing that we are a D or DD or even a G cup), many times we actually wear the wrong band size.  I know many girls that actually moved down to a 30 or 32 band and went up in cup size.  Check it out.