Understanding Sister Sizing

Ladies, we understand that shopping for bras can be a daunting experience. The variety of styles, shapes, and sizes can make the process feel overwhelming. But fret not! We're here to demystify one of the most helpful concepts in bra fitting – sister sizing. Understanding sister sizing can be a game-changer when it comes to finding the perfect fit, and we're excited to share all the details with you.

What is Sister Sizing?

Sister sizing is a bra-sizing technique that allows you to find your ideal fit even when your regular size isn't readily available. It involves adjusting the band and cup size while keeping the same relative proportions. In other words, sister sizes have the same cup volume, but different band sizes.

The basic idea is that if you go up a band size, you should go down a cup size, and if you go down a band size, you should go up a cup size. This helps maintain the same cup volume to ensure a comfortable and flattering fit.

Why Sister Sizing is Useful

1. Finding Your Perfect Fit: Not all brands and styles fit the same way, which is why sister sizing is so valuable. If your regular size isn't quite right in a particular bra, try a sister size to see if it's a better fit. This technique enables you to adapt to the unique sizing of different brands and styles while keeping your cup volume consistent.

2. Dealing with Fluctuations: Our bodies change over time due to factors like weight fluctuations, pregnancy, or hormonal shifts. Sister sizing allows you to adapt to these changes without going through the hassle of an entirely new size chart.

3. Expanding Your Options: Sometimes, a bra you adore isn't available in your regular size, but a sister size could be the perfect solution. By exploring sister sizes, you open up a world of possibilities when shopping for lingerie.

How to Find Your Sister Size

To find your sister size, you'll need to understand the concept of bra sizing. A standard bra size consists of two elements: the band size (the number) and the cup size (the letter). If you want to go up a band size, you'll go down a cup size and vice versa.

Here's a quick example:

If your regular size is 36C, your sister sizes are:

- Going up a band size: 38B
- Going down a band size: 34D

Keep in mind that while sister sizes maintain the same cup volume, there may be slight variations in fit due to the band size difference. You may need to adjust the straps or experiment with different styles to achieve the perfect fit.

Understanding sister sizing can make the daunting task of bra shopping much more manageable. It opens up a world of possibilities, allowing you to find your ideal fit in a wider range of bras and adapt to changes in your body. So next time you're shopping for lingerie, don't be afraid to explore your sister sizes to ensure you look and feel your best.

Here at Boa Boa, we're committed to helping you find the perfect bra, no matter your size or style.   Happy bra shopping!


Boa Boa bra sister sizing