Many women wear the same size bra for their entire life. Breasts constantly change shape and size throughout your life meaning different size bras are required. It is important to measure regularly if you are going to be wearing a bra. Use the following chart and instructions as a guideline:

Take a tape measure and take two measurements A and B in centimetres.

Measurement A should be taken around the fullest part of your bust.

Measurement B should be taken under the breasts, around the rib age. The tape measure should be held firmly, but not too tight.

Take measurement A and B and refer to the chart below.
(Measurement B is across the top, A is down the side)