Wearing a 34A bra when you are actually a 26D is sister sizing, but from experience

Understanding Bra Sister Sizes

Do you know your bra has something called a sister size?' These

Understanding Bra Sister Sizes

Sister Sizing De-Mystified! – Playful Promises USA

How rare is the 28DD bra size? I cannot find it anywhere and

Sister Size Bra Know Your Sister Size With Chart

Understanding Bra Sister Sizes

What's the next size up after 34A bra? - Quora

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

Understanding Bra Sister Sizes

What Are Sister Bra Sizes?