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BRA SISTER SIZES:

The Bra Secret You Should Know About

If you've found that finding your right bra size is a frustrating process, there are some sizing hacks that can make finding your perfect fit much easier. One of the most effective of these is the use of “Bra Sister Sizes”. You may be unaware that every bra size has several "Sister Sizes"- these are sizes which have an equivalent cup capacity, despite the letter of the cup size being different. Knowing your sister sizes can help you find your best fit when buying bras that run smaller or larger than normal.

It’s a common misconception that the larger the cup size, the larger the bra, no matter what the band size (i.e. a 32F is larger than a 36B, a 34C is larger than a 38A, etc). However, this is not the case. During the bra manufacturing process the same exact bra cup may be paired with different band lengths to create multiple bra sizes. For example, the same exact cup is used to make 38A, 36B, 34C, 32D, AND 32DD bras! The reason for this is that within each cup size (A, B, C, D, DD, etc), as the band size increases, the cup size also slightly increases even though the letter does not. For example, a 34B bra and 36B bra will not only have different lengths, but the capacity of the cups will also differ. Once you understand that there are equivalent “sister sizes” to your own bra size, it can help you solve any bra fitting issues you may have.

Bra Sister Size Size Comparison Chart:


Each row shares the same cup size and each column shares the same band size.
Sizes in black are sizes we make. Sizes in light gray are sizes we dont make.

30 BAND SIZES
Sister Size DOWN
Current Bra Size
Sister size UP
28B
30A
32AA
28C
30B
32A
28D
30C
32B
28DD
30D
32C

32 BAND SIZES
Sister Size DOWN
Current Bra Size
Sister size UP
30B
32A
34AA
30C
32B
34A
30D
32C
34B
30DD
32D
34C
30DDD
32DD
34D
30F
32DDD
34DD

34 BAND SIZES
Sister Size DOWN
Current Bra Size
Sister size UP
32B
34A
36AA
32C
34B
36A
32D
34C
36B
32DD
34D
36C
32DDD
34DD
36D
32F
34DDD
36DD

36 BAND SIZES
Sister Size DOWN
Current Bra Size
Sister size UP
34B
36A
38AA
34C
36B
38A
34D
36C
38B
34DD
36D
38C
34DDD
36DD
38D
34F
36DDD
38DD

38 BAND SIZES
Sister Size DOWN
Current Bra Size
Sister size UP
36B
38A
40AA
36C
38B
40A
36D
38C
40B
36DD
38D
40C




Common Fit Problems and How to Solve them Using Sister Sizes:


If your cup fits but you need a different band size.

bra band

To change your Band Size and keep the same Cup capacity, remember that the 36C with cups that fit you (for example) has the same cup capacity as the 34D with the smaller band size and the same Cup capacity as a 38B that has a larger band size .Getting your best fit will require both the band size AND cup size to change. For another example, if you are wearing a 34B bra and the band is tight but the cups fits well, instead of going up to a 36B, you should choose your equivalent sister size, 36A.




If your band fits but you need a different cup size.


bra cups


If your band fits great but your cups are too big or too small, keep the band size the same and just adjust the cup size based on your needs. For example, if you are wearing a 34B bra that fits in the band but has cups that are too small, you should choose a 34C.



If both your band and cup don't fit.

band and cup


If you both the band and the cup are a bit loose, the band should go down and the cup capacity should go down too. Remember that with a smaller band bra, the same Letter cup size is going to be smaller. For example, if you are wearing a 34B that is too loose in both the band and the cup, try a 32B. It's a smaller bra, so the same Bcup in a 32 is smaller than a Bcup in a 34. If you have a 34B that is too Tight in both band and cup, get a bigger band, and remember that in a bigger bra the same Cup Letter is bigger too. So a 36B is bigger in band and cup. By knowing your correct bra size, as well as what your sister sizes are, you will be able to choose the best option to give you a perfect fit. ! For more sizing help, international size conversions, or to try our new mobile sizing app, please go to our Sizing Help page by clicking here.

Now there's a better way to Get Your Bra Size

A new way to get your bra size measurements. After a year of testing with over 8,000 women, and six months of beta testing in the app store, we're introducing the Upbra Mobile Bra Size Calculator- the simplest bra size calculator ever. Use your phone to get your bra size in just a minute. Since you will only need it once, you don't need to download anything. Just run the Upbra Mobile Bra Size Calculator instant app through your phone's web browser. No measuring tape, no camera, no memory, no downloading.

Upbra Mobile Bra Size Calculator


If you use the Upbra Mobile Bra Size Calculator to determine your size, we will guarantee your fit. This means that if you order an Upbra bra in the size given to you by the app and for any reason it does not fit, we will reimburse you your return postage up to $8.95 USD for your return until you get the correct size fit.


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