They're sister sizes! You might fit a 28D as well.

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How to Measure Bra Size, Bra Size Calculator

Sister Bra Sizes For 28 Bra Band Size

28 and 30 Band Size Bras – Harlow & Fox

Know Your Bra Sister Size – Bratag

Find your perfect fit with sister sizing

Sister Sizing: Lingerie's Best Kept Secret

How to Measure Bra Size, Bra & Knicker Types

What bra size am I if my band is 28 and my bust is 32? - Quora

What is my bra size?

Bra sister sizing guide