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

Explained: What is Bra Sister Size with Sister Size Charts

What Are Sister Bra Sizes?

What Are Sister Bra Sizes?

Everything You Need to Know About Bra Sister Sizes - The Melon Bra

Bra Sister Sizes - Sister Size Charts

36A and 34B — they're both technically a B cup. They're called

Sister size, Bustyresources Wiki

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

Luscious Necessities - What is a bra sister size? They are

Sister Sizing is an alternate bra size. Simular but not the same

If I wear a 38C in bra size can I fit into a 34DD or a 32DDD/E? I

Sister Sizing is an alternate bra size. Simular but not the same

Finally, Bra Sizes Explained – Understanding How Bra And Cup Sizes