Answer (1 of 3): It’s mostly a estimate from multiple bra fitting events and professional bra fitters that actually know how to measure for a bra properly. As I recall the number “80%” made its way into public awareness through Oprah’s bra fitting event years ago. The number seems to be due to ho
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Where did the phrase 80% of women wear the wrong bra size come from? - Quora
80% of women are wearing the wrong bra size
Where did the phrase 80% of women wear the wrong bra size come from? - Quora
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