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

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A bra made of ultra-light fabric for everyday comfort. It features contour cups for light rounding and underwire for support. This bra's cups are

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

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ThirdLove Bra Size Chart - Find The Perfect Bra For Your Cup Size

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What does it indicate if the bra band constantly rides up at the

What are band sizes on bras, e.g. 32B? I don't get the band sizes. Does it mean that under my breasts are 32 inches not including the cup? - Quora

The Perfect Bra Size? - Start With the Underband, Not the Cups!

How do bra measurements and sizes work? This makes no sense to me. - Quora