Bra fitting : why are companies still 'adding 4'?

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The bafflingly prevalent +4 method of fitting bras (of deducing back size by measuring the underbust and adding four or five inches) is a relic from the very beginnings of the modern bra. The old, stiff materials used simply didn't have enough flex for details like breathing, and the 'right fit' came from underbusts four…

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