Women with the smallest C-cups often have smaller breasts than many women with A-cups and B-cups. For example, women such as myself who have a 28C have smaller breasts than do women with a 32B or 34A. 28C (and 26D) are equivalent in size to a 30B or 32A; they're simply on a smaller ribcage (hence the lower #) and protrude outward more (hence the higher letter).
Here are some examples of different bands of C-cup. The pictures have all been taken from Bratabase. Which of these images most closely resembles what you imagine when you hear the term "C-cup"?









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