Bra size is notoriously fickle between different lingerie brands; a C-cup at one store can easily be a D-cup at another, and some bra sizes can grow and shrink (especially in band size) over the course of a day or between washings. The best option is to know your bra size by taking bust measurements using these simple measuring instructions, which will ensure a perfect fit in band and in cup—and can even help you find the right amount of support.
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