How to Find the Right Sized Sports Bra

Guide to find the right sized bra - More than 80 per cent of British women wear the wrong sized bra.
Shadi Maleki, a bra fitter from Selfridges department store in London, offers this simple guide to finding the right fit.

To find the right back size:
Measure your bust just underneath your breasts all around your body in inches. If the measurement is even deduct four inches from this figure. If the measure is uneven deduct five inches. This is your back size.

To find the right cup size:
Measure your breasts at their widest point - the nipple - taking the measuring tape all around your back. Now deduct your final back measurement from this measurement. If the difference is five inches you are an A cup. For every inch in addition to this add an extra cup size.


source : http://www.dailymail.co.uk/health/article-35692/Why-need-sports-bra.html