Find Your Bra & Swimwear Size
The right size makes all the difference for comfort, whether it is a bra, swimwear or panties. On this page, you will find our complete guide: how to measure your band and cup size at home, how to read our size charts in both cm and inches, and how to solve common fit issues like straps that slip or a band that rides up your back. Sizing can vary between brands, and even between different bra models, so it is worth checking your measurements here even if you already know your size elsewhere.
Even if you measure carefully, or take our quiz below, it is worth ordering a sister size alongside your usual pick. Try both on at home, in your own time, and simply return the one that does not fit. Ordering two sizes and sending one back means one less delivery than ordering one, returning it, and waiting for a replacement, so you get the right fit faster too.
Answer a few questions, find your fit
If picking up a measuring tape is not for you right now, our size quiz offers another way in. Answer a few short questions about how your current bras fit, whether the band feels loose or the cup feels tight, and which styles you are drawn to, from wire-free to moulded cups, and we will match you with the sizes and models likely to work best for you. You can always retake it if a recommendation does not feel quite right.
Bra size – Measure yourself in a few simple steps
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Step 1: Measure your band size
Measure the circumference under your bust while wearing a bra.
Write down this number – you'll need it in Step 3.
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Step 2: Measure your bust (cup size)
Measure straight across the fullest part of your bust.
Note down this number too – you’ll need it in Step 3.
Step 3: Use your measurements
Now that you have your underbust and bust measurements, there are two ways to find your bra size. You can use our size calculator below or check your size in a traditional size chart.
Classic bra size chart
Click here to open the bra size chart. Some of our sports bras come in alpha sizes (S–XL). In those cases, you can use this size chart.
Classic bra size chart
Click here to open the bra size chart. Some of our sports bras come in alpha sizes (S–XL). In those cases, you can use this size chart.
Panty size guide
To find the right size for your briefs, simply measure around the widest part of your hips. Use the chart below to match your hip measurement with the correct size.
Open the panty size chart here.
Frequently asked questions about sizing
How do I measure my bra size at home?
You need two measurements: your underbust and your bust. Measure your underbust snugly around your ribcage, directly beneath your breasts, keeping the tape horizontal. Then measure around the fullest part of your bust without pulling the tape tight. The underbust measurement gives you your band size, and the difference between the two gives you your cup size. Measure while wearing a non-padded bra, or none at all, and stand upright with your arms down.
What is a sister size?
A sister size is a different size with the same cup volume. If you go down one band size, you go up one cup size to keep the volume the same, so 75D, 70E and 80C all hold roughly the same amount. This is useful when the cup fits but the band feels too loose or too tight. It is also why we suggest ordering two sizes at once and returning the one that does not fit.
What if I am between two sizes?
Choose based on which part feels wrong in your current bra. If the band rides up your back or feels loose, try the smaller band with a larger cup. If the cup feels tight or your breasts spill over the edge, keep the band and go up a cup size. Trying both at home is the quickest way to be sure, and returns are straightforward.
Why does my bra size vary between brands?
Size charts are not standardised across the industry, so a 75D in one brand can fit differently in another. Cup shape, band elasticity and how a model is cut all affect the fit, and sizes can even vary between models from the same brand. That is why it is worth checking your measurements against our size chart rather than relying on the size on the label of your current bra.
How often should I measure myself?
Once a year is a reasonable habit, and sooner if your body has changed. Weight changes, pregnancy, breastfeeding, menopause and surgery can all change both band and cup size. A bra that has been worn regularly for a long time also stretches out, so it may no longer reflect the size you actually need.
How should a bra fit when it is right?
The band should sit level around your body and stay in place when you raise your arms. Your breasts should fill the cups without spilling over the edge or leaving gaps, and you should be able to slide two fingers under the straps without them digging in or sliding off. If the band rides up at the back, that is usually the first sign the size needs adjusting.