Bra Sister Size

What is Bra Sister Sizes?

Bra Sister Sizing is a hidden secret to many woman. But knowing the bra sister sizing system (and your bra sister sizes) can be very useful when shopping for bras! So better keep on reading - doing so can make you realize that you actually can fit more bra sizes...

This is what Bra Sister Sizing is all about:

A C cup is not just a C cup (or a D cup is not just a D cup, and so on)! Bra Cup Size (cup volume) is relative to Bra Band Size; when Band Size increase (i.e from 34C to 36C US ), the cup volume gets larger. A bra in size 36C has a bigger cup (larger cup volume) than a bra in size 34C (even though they both are labeled with C-cups). The same applies to i.e. a 36B and a 38B; the 38B has a larger cup volume than the 36B (but they both have cup size letter B). But what is very interesting, is that the 38B bra actually have the same cup size as the 36C from our last example (!) And the 36B also have the same cup volume as the 34C bra from our previous example. In short: both 38B and 36C can fit the same bust - they are "sister sizes" with the same cup volume. 36B and 34C are also "sister sizes".

In short: More bra sizes can fit your bust! See which bra sizes that have same cup volume in the bra sister size charts below. Remember: Different "bra sister sizes" can be used by the same woman (cup volume will fit). But it is no guarantee that all band sizes will fit. So remember to always try bras on!

Bra Sister Size Chart, US/UK:

How to use it? Find your US/UK bra size in the chart below. All the other bra sizes placed in the same row as your bra size (same color) have the same (or about the same) cup volume. This means that all these sizes may fit your bust(!) So if the band size also fit, you may wear a new bra size next time?

Example: If you use bra size 34B, a 32C, a 36A, a 30D or a 38AA may also fit you (they all have the same cup size as your usual bra size 34B...)

Tip: Because bra bands tend to strech over time, your bra should fit tightly (but still comfortable) when new. Maybe you should try one bra band size smaller next time? Use the bra sister chart above to see which bra size (band and cup) you will need then.

Bra Sister Size, EU:

How to use it? Find your European/International (Europe/Japan) bra size in the chart below. All the other bra sizes placed in the same row as your bra size (same color) have the same (or about the same) cup volume. This means that all these sizes may fit your bust(!) So if the band size also fit, you may wear a new bra size next time?

Example: If you use bra size 75B, a 70C, a 80A, a 65D or a 85AA may also fit you (they all have the same cup size as your usual bra size 75B...)

Bra Sister Size, Australian:

How to use it? Find your AUS (Australian / New Zealand) bra size in the chart below. All the other bra sizes placed in the same row as your bra size (same color) have the same (or about the same) cup volume. This means that all these sizes may fit your bust(!) So if the band size also fit, you may wear a new bra size next time?

Example: If you use bra size 12A, a 10B, 8C or a 14AA may also fit you (they all have the same cup size as your usual bra size 12A...)

Bra Sister Size, French:

How to use it? Find your FR (France, Spain, Belgium, Portugal) bra size in the chart below. All the other bra sizes placed in the same row as your bra size (same color) have the same (or about the same) cup volume. This means that all these sizes may fit your bust(!) So if the band size also fit, you may wear a new bra size next time?

Example: If you use bra size 90A, a 85B, 80C or a 95AA may also fit you (they all have the same cup size as your usual bra size 90A...)

Your Best Bra Size Tips & Tricks...

Did Bra Sister Sizing work for you? Or have you got Bra Sister Size Tips or Tricks? Maybe a question? Let us hear. Thanks a lot.