Bra Sister Sizes - How & Why They Work

A clear, visual guide to bra sister sizes. An explanation not just of how to find your sister sizes, but also WHY sister sizing works in the first place.
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The more you read about bra fitting, the more complex it can seem. I'd like to change that, by breaking down some different aspects of it and explaining them as clearly as possible. First up, a helpful little thing called sister sizing.

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