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How to choose the best size bra.

Updated: Jan 12, 2023

We all know the big bra makers state 80% of women are in the wrong bra size. In a study from 1999; 70% are in sizes that are too big and 10% in a size too small.


1. Put on your best-fitting non-padded bra.

2. Wrap a measuring tape snugly around your rib cage, just beneath your bust line — this is the part of your body just beneath your breasts.

3. Straighten the tape so that it’s parallel to the floor.

4. Exhale deeply – you want the smallest measurement possible.

5. Round to the nearest whole number and refer to the size chart below.


1. Measure loosely around the fullest part of your bust, with the tape straight across and around your back, bringing it to the front.

2. Subtract your band measurement (from step 1) from this bust measurement.

The difference calculates your bra size – each inch represents a cup size. For example, if you measure a 34 inch band size, and a 36 inch cup size, the difference is 2: which would indicate a B cup. Ruby Ribbon sizes uniquely without having to have exact cup measurements. Our cups are also designed to support each breast seperately making it an amazing mastectomy bra specifically for asymmetrical cups.

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