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Sister Sizes: What Are They And How Do I Find Mine?

We all have them – those bras that just won’t fit quite right no matter what we do. If your current bra isn’t providing the support you need or the comfort you deserve, it might be time to upgrade to one of your sister sizes! Sister sizes can be difficult to understand at first, but understanding how these different sizes work is one of the best ways to make sure you’re getting the best fit for your body.

 

In this guide, we’ll cover what sister sizes are, why they’re important, and the easiest way to figure out what your sister size might be so you’ll know what size bras to buy in the future.

 

What is Sister Sizing?

Sister sizes are different bra sizes that fit similarly because they have the same cup volume but have different band sizes. For example, if you have 34B breasts, sister sizes are 32C and 36A because they both have the same cup volume of B while the band size differs by 2 inches (2’’). Sister sizes exist in every size – bigger and smaller. Knowing what sister sizes you should try will help ensure that you find the perfect fit every time.

 

Why Should I Know My Sister Size?

Every woman has her favourite set of bras that fits her perfectly and makes her feel sexy. But even the best-fitting bras lose their shape over time, so it’s important to know your sister size in case your current bra doesn’t fit like it used to. A sister size is basically an alternate size of the same cup volume.

 

How Do I Find My Sister Sizes?

Finding your sister sizes is a two-step process. First, you need to measure yourself. This is done by taking your measurements in inches or centimetres and converting them into the corresponding bra size. The second step is to convert this number into your sister size; which will be either one size higher or lower than your actual bra size. To find your sister size, simply take one inch off or on from the band on your current bra, add or reduce one cup, and voila! You should try this new size for both cup and band measurements to see which one fits better.

For example, when going one size up –
If your bra size is 32B, your sister up will be 34A.

When going one size down-
If your bra size is 32B, your sister down will be 30C.

Sister Size Chart:

How Does Wrong Size Affect My Breast Shape?

Some women have a rounder breast shape, while others have a more pointed shape. The size of the cup is what determines whether or not your bra will fit properly. When you buy a bra, it is important to try on several sizes until you find the one that fits correctly. Bras that are too big in the cup size can cause your breasts to spill out of the top of your bra while bras that are too small can cause the cups to dig into your chest.

How Can I Use This Information When Shopping For Bras?

Finding your sister size is easy. All you need to know is your current bra size, the brand’s size range, and the number of cups. Once you have that information, you can then use it to determine which sister size would best fit you.


Because Woo recognizes the value of a flawless fit, it provides a perfect-fitting bra for any breast shape with a wide choice of sizes and styles. Give Woo a try!

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