What are band sizes on bras, e.g. 32B? I don't get the band sizes

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What are band sizes on bras, e.g. 32B? I don't get the band sizes

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How to help her to find a perfect fit? Her band is too tight and

What is my bra size? My underbust is 28 inches and bust is 32 inches. I was previously recommended a 28D, but the band was too tight, so it didn't fit. - Quora

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Can someone have different band sizes but the same cup size in