Sister Sizing is an alternate bra size. Simular but not the same. 32c ,34b , 36a are Sister sizes.

Sister Sizes: The Bra Secret Every Person Should Know – Sister

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Sister Sizes

What Are Bra Sister Sizes And Why Do They Matter? - SHEFIT

All.you.lively Women's No Wire Push-up Bra - Warm Oak 38b : Target

Bra Sister Sizes + Sister Size Chart

Sister Sizes: The Bra Secret Every Person Should Know – Sister

Sister Sizing 101

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Explained: What is Bra Sister Size with Sister Size Charts

What is the difference between 32C and 34B bra sizes? - Quora

Expert's Guide to Finding the Right Bra Size

Sister Sizing De-Mystified! – Playful Promises Australia

Bra Sister Sizes + Sister Size Chart