Sister Size

Sister Size of Bra

Looking for perfect size lingerie is commonly an entirely clear encounter. Sizes become bigger as they advance, and that’s all there is to it. Bra sizes, then again, are not exactly as basic. You need to consider factors, for example, your unique breast shape, your band size, and your cup size — all of which infrequently coordinates perfectly with a solitary number and letter. This is the place sister sizes come in.

Sister sizes are gatherings of bra-size reciprocals that are connected by cup volume. For instance, a 36F (DDD) cup has a place with a similar family as a 38E, a 40D, and a 42C. Stick with us — we’ll clarify. In any case, simply realize that your ideal fit may at present be out there sitting tight for you. Also, we’re going to assist you with finding yours today.

Sister Size of Bra
Sister Size of Bra

Odds are, you adapted someplace along the line that you had a bra size, and if it kind of fit, that was fundamentally the finish of the story. You may have additionally imagined that except if one’s bosoms really changed size, there was only no chance somebody who was, for instance, a B cup could likewise be a D cup. Wrong.

Bra sizes are more similar to proportions. The volume of a cup size (or how much bosom tissue it can hold) differs from the band size. Let us separate it for you.

The Importance of Knowing Your Bra Sister Size

If you’ve ever struggled to find a bra that fits your unique shape, you’re not alone. It’s no easy feat, and even less so when you’re unfamiliar with your sister sizes. Remember: it’s not you, it’s your bra. Identifying your sister size can be especially helpful if you find that neither your cup nor band fits properly.


Sister Size of Bra
Sister Size of Bra

How to Calculate Your Sister Size

Go up a band size (if your band is too tight), but go down a cup size. The same rule applies in the reverse if your band is too loose: go down a band size, but go up a cup size. We promise It only sounds more complicated than it is, so we created a handy sister size calculator for you to reference.

Find your current bra size, and your sister sizes are the ones listed in the same row (going across). So, for example, if you’re a 34C, your sister sizes are 30E, 32D, 36B, and 38A. Each row is a family of sister sizes. Let that hit home for a second: an A cup can likewise be an E cup. Wild, correct?

Sister Size of Bra
Sister Size of Bra


What’s astonishing about sister sizes is that even though they can be irrational, they’re vital to finding an extraordinary fitting bra. For instance, in case you’re wearing a 34C and the cups fit, yet the band is little, you may think “I’ll simply go up a band size and attempt a 36C.” However, evaluating that way will probably bring about cups that are too huge because a 36C’s sister size is a 34D. The following sister size to a 34C is a 36B, which is the new size to attempt. The cups will at present be a similar size, yet the band will be roomier.

Here’s a breakdown of what to do in a couple of explicit situations:

Your band fits, yet your cups don’t: If the cups feel little, go up a cup size. If the cups feel huge, go down a cup size. (Ex. On the off chance that the 32F feels little in the cups, go up to a 32G. If the 32F feels large in the cups, go down to a 32E1/2).

Your cups fit, yet your band doesn’t: Adjust both your band and cup size. Keep in mind: on the off chance that you go up a band size, you have to go down a cup size, and the other way around. (Ex: A 34C cup is equivalent to a 36B. A 40E(DD) cup is equivalent to a 42D.)

Neither your cup nor band fits: Go down a band size if they’re both too large, or go up a band size on the off chance that they’re both excessively little. Try not to stress over changing your cup size — it’ll commonly alter with your band! (Ex: If a 32D is excessively little, attempt a 34D.


Sister Size of Bra
Sister Size of Bra


Furthermore, sister sizes work with our unique half-cup sizes, as well. In case you’re a 34B½, you’re likewise a 36A½ and a 32C½. Since every one of those sizes has proportionate cups, the bra you pick relies upon which band size feels best to you.

Since you think about sister sizes, you’ll be prepared to pick bras that fit you all the more exactly. Our objective at ThirdLove is to assist ladies with finding their ideal fit, so don’t keep sister estimates a mystery. Tell a companion, associate, or—obviously — your sister.


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  • Very good article. I will be going through some of these issues as well.. Marcelia Justino Ame

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