What are Sister Bra Sizes?
Sister bra sizes are alternative sizes that share the same cup volume but differ in band size. When you go up a band size, you go down a cup letter—and when you go down a band size, you go up a cup letter. For example, 34B, 32C, and 36A are sister sizes. This concept helps you find a better fit when your usual size feels slightly off, while keeping the cup volume consistent.
You may need to try sister sizes in several situations. If your band feels too tight but the cups fit well, moving to a larger band and smaller cup can help. If the band is loose but the cups are perfect, you can go for a smaller band and larger cup. Sister sizes are also useful when your exact size is out of stock, when switching between brands with different sizing standards, or when your body changes due to weight fluctuations, hormonal changes, or comfort preferences.
Here’s a quick guide to sister sizes across common bands (32–48) and cups (A–E)
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