Your current bra size has “sister sizes”- alternate sizes where the cup volume stays the same even though band size and cup letter changes.

Sister Size Down:

One actual size smaller than your current band size and one letter name larger than your current cup. For example, if you wear a 34C, your sister size DOWN would be 32D.

Sister Size Up:

One actual size larger than your current band size and one letter name smaller than your current cup. For example, if you wear a 34C, your sister size UP would be 36B.