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The number is the "band size" or "back size," and refers to the size of your frame excluding your breasts. The correct band size will usually be your underbust/ribcage measurement rounded to the nearest even number, for example if your underbust measures 33 inches you will most likely need a 34.

The cup size is represented by a letter, and this is relative to the band size so if you currently fill a 36C but you need a 34 band, then a 34C will be too small. You will need to try a 34D - go up one cup size for every band size that you go down.

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Q: What do the numbers in a bra size mean?
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