Little knowledge

Explore the secrets of sister size

by WongHayley on Oct 19, 2023

A woman is measuring her bust size

When it comes to bras, one size does not fit all. Finding the perfect bra can be a daunting task, especially when every brand and style seems to have its own set of sizing quirks. Enter sister size, the secret weapon in the world of bra fitting. In this post, we're diving deep into the concept of sister size to help you unlock the comfort and confidence you deserve.

Understanding the Problem of Underfit Bras

A woman have strap mark on her shoulders from bra.

Those moments when you slip into a beautiful bra, only to find that it's anything but comfortable. The straps dig into your skin, the cups feel constricting, and it's a constant battle to adjust throughout the day. It's enough to make you want to banish your bras forever.
But before you contemplate a braless life, hold on a second. The issue isn't with you; it's with the fit of your bra. An underfit bra is like a shoe that's a size too small – it simply doesn't work. Here's a quick checklist to help you identify if you're grappling with an underfit bra:

Constant Adjustments

Are you perpetually fidgeting with your bra, pulling up straps, or rearranging cups? It's a surefire sign of discomfort.

Bulging or Gapping

Do you notice unsightly bulges or gaps under your clothing? Not only is this uncomfortable, but it can also affect your overall appearance.

Underwire Woes

Does your bra's underwire feel like a miniature torture device? If it's poking or digging into your skin, it's time for a change.

Strap Slippage

Are your bra straps on a mission to escape your shoulders? Even after tightening them, do they continue their descent? That's a telltale sign of an ill-fitting bra.

Band Riding Up

Does the band of your bra creep up your back during the day? This indicates that the band size is too large.

Breast Spillage

Perhaps the most uncomfortable of all – do your breasts spill over the top or sides of your bra cups? It's not just uncomfortable; it also impacts your silhouette.

Now that we've identified the telltale signs of underfit bras, it's time to introduce our hero – sister sizes.

What is sister size?

Sister size is like the best-kept secret of the lingerie world. Simply put, they are different bra sizes that share the same cup volume. This means you can adjust the band size while keeping your bust size consistent. Whether you're dealing with a too-tight band, straps that dig into your shoulders, or cups that aren't quite right, sister size can come to the rescue.

How does sister size work?

Let's break it down. Imagine your usual bra size is 34C. If you're trying on a bra and find that the band is uncomfortably snug, you can go up in band size while keeping the same cup volume. In this case, your sister size would be 36B (one band size up) or 32D (one band size down).

On the flip side, if the band is too loose and you're swimming in it, you can go down in band size while increasing the cup size. Sticking with the 34C example, you might explore 32D (one band size down) or 36B (one band size up).

As shown in the diagram, the diagonal line represents sister sizes. Don't be fooled by their different cup labels; they actually have the same cup size; the difference lies in the band size.

sister size chart

Why should you care about sister size?

Here's the magic of sister size: they give you more options to find that ideal fit. Not all bras are created equal, and sizing can vary from brand to brand and even from one style to another. Sister size empowers you to navigate this sizing maze with confidence.

How to Find Your Sister Sizes

Know Your Current Size

To begin, you'll need to know your current bra size. If you're unsure about your size, you can check our size guide to determine your current size.

Sister Size Up

To find your sister size with a larger band size and smaller cup size (sister size up), simply go up one band size while going down one cup size. For example, if you're a 34C, your sister size up would be 36B.

Sister Size Down

Conversely, to find your sister size with a smaller band size and larger cup size (sister size down), reverse the process. Go down one band size while going up one cup size. Using the same example, if you're a 34C, your sister size down would be 32D.

Try It On

Don't be afraid to try on a few sister sizes when shopping for bras. Different styles and fabrics can affect the fit, so experimenting is key.

Comfort Is Key

Always prioritize comfort. If a bra feels great, offers support, and enhances your confidence, you've found a winner.

Final Thoughts

Sister sizing is like having a secret weapon in your lingerie arsenal. It's all about finding that perfect balance of comfort and support. The next time you're on the hunt for a bra that fits just right, remember the power of sister size. Embrace the versatility, explore your options, and step into a world of bra-fitting bliss. Your comfort and confidence will thank you.

Remember, when it comes to bras, sister size can be your best friend. Whether you're shopping for everyday comfort or something a bit more special, understanding the concept of sister size can help you navigate the world of bras with ease. Happy bra shopping!

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