A 28DD is small. VERY small. Its sister sizes are 30C and 32A. A 42DD is

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Find your perfect fit with sister sizing

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Everything You Need to Know About Bra Sister Sizes - The Melon Bra

Meesa - Sister sizes are sizes that have the same cup capacity but

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International Bra Size Chart - Bra Size Calculator

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If I have a band size of 26' and bust size of 31', what is my bra