Careers at la Vie en Rose
Does your bra never feel right? Maybe the straps keep slipping, the band rides up, or you’re just never fully comfortable. If so, you’re far from alone.
A study published on PubMed, the NIH’s medical research database, found that 80% of women wear the wrong bra size. And honestly, it’s no surprise. Bra sizing is anything but intuitive.
With sizing systems that vary from one country to another, cup shapes that change by style, and cuts that differ across brands, it’s easy to feel confused and end up in a size that doesn’t fit.
That’s why our bra experts created this guide. Inside, you’ll find a three-step measuring method, and expert tips to help you spot the signs of a poor fit and how to correct them.
Because a well-fitted bra isn’t a luxury, it’s the foundation.
How to Measure Your Bra Size?
According to our expert, Bianca Izzo, Vice President of Design and Creative Strategy, your ideal bra size depends on two things: taking the right measurements and understanding how to interpret the results. The number represents the band size, while the letter indicates the cup and its corresponding breast volume. Both measurements are essential for achieving a perfect fit.
What you'll need:
A soft measuring tape, an unlined or lightly lined bra and, ideally, a mirror.
STEP 1 | THE UNDERBUST
Your underbust measurement is the circumference of your ribcage measured directly beneath your breasts. It is used to determine your band size.
How to measure your underbust:
- Wrap the measuring tape flat under your breasts, parallel to the floor.
- Breathe normally. Avoid taking a deep breath or holding your breath.
- Take note of the measurement without pulling too tight or leaving too much slack. Between two sizes? Round up to the nearest measurement. Find out your band size.
STEP 2 | THE BUST
Your bust measurement is the circumference of the fullest part of your bust, taken by wrapping a tape measure horizontally around your chest.
How to measure your bust:
- Wrap a measuring tape around the fullest part of your bust (at nipple level), keeping it straight and parallel to the floor.
- Take note of the measurement without compressing your breasts. The tape should rest lightly against the skin. Between two sizes? Round up the measure.
STEP 3 | THE CUP
The cup indicates breast volume. You determine it by comparing your bust measurement to your underbust measurement.
INTERPRET YOUR RESULTS
Find Your Band Size
Using your underbust measurement from Step 1, refer to the chart below to find your band size.
| STEP 1 MEASUREMENT IN / CM |
BAND SIZE CA / US |
|
|---|---|---|
| 27 - 28 in | 69 - 71 cm | 32 |
| 29 - 30 in | 72 - 76 cm | 34 |
| 31 - 32 in | 77 - 81 cm | 36 |
| 33 - 35 in | 82 - 89 cm | 38 |
| 36 - 38 in | 90 - 96 cm | 40 |
| 39 - 41 in | 97 - 104 cm | 42 |
Find Your Cup Size
Using your result from Step 3, refer to the chart below to find your cup size.
| STEP 3 MEASUREMENT IN / CM |
CUP SIZE CA / US |
|
|---|---|---|
| 1 in | 2,5 cm | A |
| 2 in | 5 cm | B |
| 3 in | 7,5 cm | C |
| 4 in | 10 cm | D |
| 5 in | 12,5 cm | DD |
Concrete example :
You measure 32.5 in under your bust (underbust measurement) → round up to 33 in → band size 38.
You measure 37 in around the fullest part of your bust (bust measurement). 37 – 33 = 4 in → D cup.
Your bra size is 38D.
Is My Bra the Right Fit?
According to Bianca, a few key details can make all the difference. Band fit, strap positioning, and cup comfort are all important factors in finding your perfect bra size.
BAND
A properly fitting band should feel snug without digging into your sides. It should sit level and not ride up in the back.
STRAPS
Properly adjusted straps should not dig into your shoulders. They should stay in place and lie flat.
CUPS
The right cup size should fully contain and support your breasts.
A properly fitting band should feel snug without digging into your sides. It should sit level and not ride up in the back.
Properly adjusted straps should not dig into your shoulders. They should stay in place and lie flat.
The right cup size should fully contain and support your breasts.
Understanding Bra Sizes
A proper bra fit is about more than just finding the right size. At la Vie en Rose, every bra is designed from the inside out. We get the structure right first—wire shape, cup depth, side support—before adding the details you'll love.
We believe everyone deserves a bra that feels as good as it looks. For us, comfort and style have always gone hand in hand, built together from the very beginning.
What Is the Band?
The band refers to the number in a bra size. It's the horizontal elastic section of the bra that wraps around the ribcage.
The band provides 70 to 80% of a bra’s total support. The straps only stabilize vertically. That’s why a loose band is the leading cause of inadequate support.
Three simple checks to confirm your band size:
- The two finger test: you should be able to slide exactly two fingers under the band at your back—no more, no less.
- Horizontal fit: the band should sit perfectly straight across your back, without riding up toward your shoulder blades. According to our expert Bianca, it provides most of the support.
- The new bra rule: on a brand new bra, always fasten the hooks on the second row from the wing.
What Is a Cup?
The cup is the letter that follows the number in a bra size. It represents breast volume, measured by the difference between your bust measurement at the fullest part of your chest and your band measurement.
What's important to understand: the cup is relative to the band. A 34C cup does not have the same volume as a 38C cup. The larger the band, the greater the volume for the same cup letter.
According to our expert Bianca,
a properly fitting cup should:
- Fully support and contain the bust, with no spillage on the sides.
- Never gape or pull away from the body. The bra should move with you, not against you.
Sister Sizes
Sister sizes are bra sizes with different numbers and letters that share the same cup volume. They help you adjust the fit to your body while maintaining the same level of coverage and support.
The Sister Size Rule: when you go up one band size (e.g., from 36 to 38), go down one cup letter (e.g., from C to B) to maintain the same volume.
When to use sister sizes? If your usual size is out of stock, if you're between two band sizes, or if you'd like a firmer or more relaxed fit while keeping the same cup volume. We cover this useful tool in full detail in our complete Sister Size Guide.
The Most Common Fitting Mistakes
How to Tell If Your Bra Fits Properly
Straps that slip, a band that rides up, marks on your skin, or cups that gap—these common fit issues are your bra’s way of telling you something. The good news? Once you know what to look for, they’re easy to fix. Fit expert Bianca is here to help you decode the signs and find your perfect fit.
Straps that slide off your shoulders are a sign that your band is too loose. The straps end up overcompensating for the lack of support and eventually slip down.
Bianca's solution:
- Go down one band size.
- Check that your straps aren't too loose—adjust them until you can slide two fingers underneath, but no more.
A band that rides up toward your shoulder blades is the classic sign that the band is too big. A band that is too loose may not sit properly in place and can be pulled upward.
Bianca's solution:
- Go down one band size.
- If you've just bought the bra and are already on the tightest hook, something's off—the band is too big for your frame.
Red marks on your back or shoulders can have two very different causes:
- Marks on the shoulders: the straps are too tight and/or the band is too loose, which forces the straps to carry all the weight. Loosen the straps and/or go down a band size.
- Marks on the back: the band is too small, or the bra is worn out, and the elastic can no longer absorb the pressure. Go up a band size, or replace the bra.
Cups that gape or wrinkle indicate the cup is too large for your breast volume.
Bianca's solutions:
- Go down one cup letter (e.g., from C to B).
- Try a sister size if the band fits well (e.g., 36C → 34D).
- Consider the cup style: moulded (padded) cups tend to gape more easily than lace or soft fabric cups.
EXPERT CHECKLIST
These details are invisible when they’re right—but your body feels it immediately when they’re not.
In-store fitting tip: In la Vie en Rose boutiques, our lingerie experts can take your measurements, assess your bust shape, spacing, and projection, and recommend the bra styles, cup types, and sizes that suit you best.
Frequently Asked Questions About Bra Sizes
Yes. Sizing is not standardized internationally, and even within the same country, each brand may use its own patterns and construction methods.
What to do:
- Always refer to each brand's own size guide.
- Try before you buy whenever possible.
- For online purchases, check the returns and exchange policy At la Vie en Rose, you have up to 30 days to exchange or return your purchases.
No soft measuring tape on hand? A piece of string, cord, or non-stretch ribbon works just as well. Wrap it around the area you want to measure, keeping it snug but not tight, then mark where it meets. Lay it flat and measure it with a ruler—you’ll get just as accurate a result as with a traditional measuring tape.
Ideally, with an unlined or lightly lined, non padded bra. Padded bras add artificial volume and can throw off your bust measurement, and therefore your cup calculation.
Yes—and that's precisely the principle behind sister sizes. The cup is relative to the band: when you go up one band size, the same breast volume corresponds to one cup letter lower.
The answer varies depending on how often you wear it, how many bras you rotate, how you care for and store it, as well as changes in your body, such as pregnancy, breastfeeding, or weight fluctuations. According to la Vie en Rose experts, the average lifespan of a bra is between 6 and 9 months with regular wear. Not sure if yours has run its course? Our complete guide on bra lifespan has everything you need to know.
Bianca’s advice: If a bra that used to fit you perfectly suddenly doesn’t feel right anymore, trust your body. Refresh your lingerie drawer the same way you update your wardrobe. Your bra should support the woman you are today, not the one you were five years ago.
DISCOVER OUR STYLES
DISCOVER OUR STYLES
Your Bra Guide Essentials
Finding the perfect bra really comes down to two things: choosing the right style and getting the right size. This guide, written by our experts at la Vie en Rose, walks you through our must-haves, bra styles, lining options, and specialty bras. You'll also find the key information you need to measure yourself properly, extend the life of your bras, and care for them correctly.
La Vie en Rose
Bra Expertise
For over 40 years, la Vie en Rose has designed bras made for women, by women who get it. Here's what makes us different: we build every bra from the inside out. Structure comes first—the underwire shape, cup depth, side support—and only once that's nailed down do we move on to the look.
Our design team, led by VP of Design and Creative Strategy Bianca Izzo, obsesses over every detail, from fabric to cup finish, so every woman gets comfort and support that works. You'll see that expertise in every collection we create, each one designed to support women through every stage of life.
The right bra can change everything: your comfort, your posture, your confidence, and even how your favourite outfits fit. Yet did you know that most women aren't wearing the right size?
At la Vie en Rose, we believe every woman deserves to feel great in her bra from the very first try-on. Whether you're after something invisible under t-shirts, a relaxed option for lounging at home, or a specialty bra suited to a particular stage of life, this guide was built to help you see things clearly.
A Better Understanding of Your Bra for a Better Fit
Before you can find a bra that really works for you, it helps to understand how it’s built and what each part does. Every piece plays a role in how supported and comfortable you feel.
Cups: Cradle and shape the breasts. Soft, pre-shaped, or padded, the cup construction defines your shape and support level.
Band: Wraps around your torso and does about 80% of the support.
Straps: Adjustable and responsible for the remaining 20% of support. They shouldn’t dig into your shoulders or slip off.
Bridge: The small piece between the cups. On a well fitting bra, it lies flat against your chest and helps keep everything centered and stable.
Underwire: Optional feature - a metal or semi rigid piece under the cups that gives the bra its structure.
Closures: Usually a hook and eye fastening at the back with several rows to adjust the fit. Some bras close in the front instead.
Expert tip:
Expert tip:
If your bra feels uncomfortable, start by checking the band. Since it does most of the supporting, it’s often the part that causes pressure or discomfort when the fit isn’t quite right.