Question 1

What are sister bra sizes?

Accepted Answer

Sister sizes are bra sizes with the same cup volume but different band lengths. If you go down a band size, go up a cup size; if you go up a band size, go down a cup size.

Question 2

How do I find sister sizes?

Accepted Answer

Use the rule: down band → up cup; up band → down cup. Try one or two steps. Our Sister Sizes Finder suggests options for US/UK/EU/JP systems.

Question 3

Do sister sizes work across US/UK/EU/JP?

Accepted Answer

The concept is the same, but cup letters differ by system. Use sister sizes within one system, then convert if needed.

姐妹尺码：指南与查找

姐妹尺码的原理

姐妹尺码查找

文胸尺码计算器

WHR 计算器

国际转换

热门尺码指南