Before you ask, no. Sister sizes is not your sister’s size hahaha!

Jokes aside, finding the perfect bra can sometimes feel like hunting for a unicorn (especially during online shopping!). It may be frustrating, and full of trial and error. But what if we told you there’s a hidden trick that could unlock a world of better-fitting bras without compromising on comfort or style? Cues sister sizes, the secret weapon for a stress-free bra shopping experience!

Disclaimer: We always recommend to refer to each of the brand's own unique size and measurement charts, as sizing and guidelines may vary between brands. There's no "one-size-fits-all" when it comes to finding the perfect support and comfort for your innerwear. Find out your Neubodi size here.

Hang on with us as we’ll uncover everything you need to know about sister sizes, how they work, and why every woman should know her sister size. No more saying goodbye to cute lingerie that just somehow doesn’t have your size :( 

What Are Sister Sizes?

Sister sizes are alternative bra sizes that have the same cup volume but different band sizes. Think of them as your bra’s cousins: slightly different in one way, but still closely related.

For example, if you’re usually a 75C, your sister sizes would be 80B (a looser band, smaller cup) and 70D (a tighter band, larger cup). These sizes offer more flexibility and options when your go-to size doesn’t fit perfectly or is not available in stock.

Neuteam’s note: If you are wearing on the outermost hook for your usual size, we do not recommend going for the tighter band, larger cup. Example: If you are 75C, wearing the outermost hook, we do not recommend 70D as an alternative sizing as it may definitely be too tight for you T^T

How Do Sister Sizes Work?

The magic of sister sizes lies in the relationship between the band size and cup size:

As the band size goes up ⬆️, the cup size goes down ⬇️.

As the band size goes down ⬇️, the cup size goes up ⬆️.

This means that the letter part of the bra size (A, B, C, D) doesn’t represent a universal cup size—it changes depending on the band size. For example, a 75C and a 80B have the same cup volume but different band fits.

How to Find Your Sister Size?

Here’s an easy guide to finding your sister sizes:

Go up ⬆️ a band size and down ⬇️ a cup size.

Example: 75C → 80B

Go down ⬇️ a band size and up ⬆️ a cup size.

Example: 75C → 70D

Why Sister Sizes Are a Game-Changer?

• Perfect for In-Between Sizes: If your usual size feels just a little too tight or loose, a sister size could be the solution.
• Broaden Your Shopping Options: When your size is out of stock, knowing your sister size gives you more choices.
• Accommodates Body Changes: Weight fluctuations, pregnancy, and hormonal changes can affect your band or cup size. Sister sizes provide flexibility without compromising fit.

When Should You Consider a Sister Size?

• Band Too Tight or Loose: If your bra band digs in or rides up, try a sister size with a larger or smaller band (based on the guide above!).
• Limited Stock: If your usual size isn’t available, and you REALLY need that bra, sister sizes might save the day.
• Different Brands, Different Fits: Not all brands size bras the same way. Knowing your sister sizes helps you find a better fit across different styles.
• Style-Specific Adjustments: Different bra styles can fit differently. Sister sizing can help you find a better fit for strapless bras, sports bras, or balconettes.

Fun Facts About Sister Sizes

Fun Fact #1: International Sizing Differences

European and US bra sizes differ, but sister sizing helps bridge the gap.

Fun Fact #2: Not All Bras Fit Equally

A 75C in one brand may not fit the same in another. Knowing your sister sizes gives you flexibility across brands.

Fun Fact #3: Sports Bras Are an Exception

Sister sizing isn’t always applicable for highly structured sports bras that need a snug fit.

Pro Tips for Shopping with Sister Sizes

Pro Tips #1: Start with Your Regular Size

Always try your usual size first before experimenting with sister sizes. Do make sure to check on the brand’s return/exchange policy first when shopping online!

Pro Tips #2: Prioritize the Band Fit

The band should feel snug but comfortable—it provides 80% of the bra’s support. We do recommend prioritizing a well-fitting band over cup size.

Pro Tips #3: Test Different Styles

Some bra styles fit differently, so your sister size MAY work better for certain designs. When in doubt, please get advice from the consultants in store. 

Why Knowing Your Sister Size Matters?

Wearing the wrong bra size can lead to discomfort, back pain, and even posture issues. Knowing your sister sizes not only enhances comfort but also boosts your confidence. A well-fitted bra makes all the difference, and sister sizing is a powerful tool in your bra-shopping arsenal.

Ready to Find Your Sister Size?

Next time you’re bra shopping, remember to experiment with sister sizes. It could be the key to finding your perfect fit. Whether you’re looking for a comfy everyday bra, a supportive sports bra, or a gorgeous lace piece, sister sizes ensure you’ll never compromise on fit or style again.

Your perfect bra is out there. Sometimes, it just takes a little help from its sister! ;) 

[or just find our professionally trained consultant - find the nearest outlet here or talk to our consultants online].

For more of Neubodi panty and lingerie, check out the full collections at www.neubodi.com.

Related blogs you may be interested in: 

• 5 Expert Tips: How to Find the Right Bra?
• Bra Anatomy: Get To Know Your Bra
• 5 Reasons Why You Should Invest In A Bra That ACTUALLY Fits You
• Neubodi Bra-Education Comic EP1: MAKING SENSE OF BRA SIZES