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  1. For reference, any cup with a 34 band size is considered a “true cup” size. This means that a 34AA is in fact a AA cup, just as how a 34B is a true B cup. However, a 34B is also equivalent in cup volume to a 30D, 32C, and a 36A. All three aforementioned sizes are a B cup despite what their cup letter indicates. This is called sister sizes.
    www.thirdlove.com/blogs/learn/bra-sizes-meaning
    E.g., the sister size of 36Awill be 34B.
    www.clovia.com/blog/bra-size-unavailable-sister-cu…
     
  2. Bra Sister Size - SizeChart.com

    In short: both 38B and 36C can fit the same bust - they are "sister sizes" with the same cup volume. 36B and 34C are also "sister sizes". In short: More bra sizes can fit your bust! See which bra sizes that have same cup volume in the bra …

     
  3. Bra Sister Size Chart in US – SizeChartly

    Essentially, sister sizes refer to bras that have a different band size but the same cup size. For example, if you typically wear a 34B, but the band is too tight, you might try a 36A instead. There are a few things to keep in mind when using a …