How rare is the 28DD bra size? I cannot find it anywhere and

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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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How rare is the 28DD bra size? I cannot find it anywhere and

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How rare is the 28DD bra size? I cannot find it anywhere and