two women in plus size bra

Bra sister sizes. Do I have a sister size?

If you know about bra sister sizes, you’ll know everything you need to know about bra sizing.

Why?

  • We all have a sister size we could wear. For example, the bras 40C and 38D have the same cup volume and might fit the same woman.
  • Especially if you’re in between two possible sizes (most women are in between sizes)
  • If you know the alternative sizes you can choose from, it makes shopping so much easier.
  • Bra brands may have a different fit and you might need to go down or up with the band and cup size.

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Let me tell you some more about bra sister sizing. And with some easy to understand examples, you’ll see what happens with your cup size when going up or down a band size.


What are bra sister sizes?

Every bra size is surrounded by a set of bra sister sizes. Although these sister sizes have a different band size and cup number, the cup volume of the sister size is the same.

Example of the sister bra sizes of 36C

I myself have 3 different bra sizes that fit me just fine. I have one bra size I wear the most. Sometimes I go for a band size 36 instead of the 34 I usually wear. In this case, I go down a cup size to keep the same cup volume.

The cups in a 36 are also a bit wider set and I find this sometimes better for me. Depending on the brand and bra style I try different sizes and actually own different sizes.

woman holding measuring tape
Regular measuring of your bra sizes is no luxury

When measuring your band size, hold the tape firmly around your body. Measuring your bust size should be done over the fullest part of your busts. Read more about measuring your bust size here »


Bra sister sizes: going up a band size

Going up a band size – want to keep the same cup size

You wear a 36C bra and are not happy with the band size finding it a bit too tight. You don’t wanna change the cup size.

  • you choose bra size 38B (that is your bra sister size).
bra sister sizing example
A 36C and a 38B have the same cup volume

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Bra sister sizes: going down a band size

Going down a band size – want to keep the same cup size

You wear a 36C bra and are not happy with the band size finding it a bit too loose. You don’t wanna change the cup size.

  • you choose bra size 34D (that is your bra sister size)
A 36C and a 34D have the same cup volume

If you want to change your band size but not your cup size you will have to know what to choose. Because when going up or down a band size, the cup size of the bra will have to change too in order to keep the same cup volume.

Knowing about bra sister sizes will give you more control when shopping for a bra. Depending on the bra style and the bra brand, you’ll know what sizes you can try.

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» Take me to the bra size calculator



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