Updated 10 September 2025
Most of us have been there. You slip on your bra in the morning and by lunchtime you’re fidgeting, adjusting, and dreaming of the moment you can take it off. The truth? It’s probably not you—it’s the bra. Or more accurately, the bra size. Studies suggest that around 80% of women are wearing the wrong size, which can cause everything from discomfort to posture problems.
So, how do you know if your bra isn’t doing its job? Here are 10 tell-tale signs that you’re wearing the wrong bra size.
If your straps leave painful red grooves, your band is likely too loose. Instead of the band doing the heavy lifting, your straps are taking all the weight. Not only is this uncomfortable, but it can lead to shoulder and neck pain.
On the flip side, if your straps slide down no matter how much you tighten them, it’s another red flag. This usually means your band is too big and isn’t anchoring the straps properly.
Your band should sit in a straight, firm line around your body. If it creeps upwards, your band size is too large. The band is meant to provide 80% of your bra’s support, so if it’s loose, everything else is thrown off.
Do your cups look empty or baggy? That means the cup is too big for your breast volume. Your bra should sit smoothly across your bust without any gaps.
On the other hand, if your breasts are spilling over the cups—creating the dreaded “quad-boob”—your cup size is too small. Side spillage is another giveaway. Either way, you need to size up.
Underwire should fully frame your breast and lie flat against your ribcage. If it digs into your breast tissue or sits awkwardly on top, it’s the wrong size or style for you.
The gore (the piece of fabric between the cups) should rest snugly against your chest. If it floats away or feels wobbly, your cups are too small or the band is too big.
If you find yourself pulling at your band, shifting your straps, or scooping your breasts back into the cups all day, your bra isn’t fitting correctly. A well-fitting bra should stay put without effort.
Wearing the wrong size can cause more than annoyance—it can lead to real pain. A bra that doesn’t support properly forces your muscles to pick up the slack, creating strain in your shoulders, neck, and even your back.
This one’s simple: if you can’t wait to rip it off at the end of the day, it’s the wrong bra. The right size should feel comfortable, supportive, and almost unnoticeable.
The right bra size isn’t just about comfort. It can improve your posture, prevent pain, and even make your clothes look better. Plus, you’ll feel more confident knowing everything is supported and sitting where it should.
If you’ve ticked “yes” to more than a couple of these signs, it’s time to reassess your size. Don’t worry—finding the right fit is easier than you think. Check out our Fitting Room to learn how to measure yourself properly. Or, if you want quick personalised recommendations, try our Bra Finder tool.
A bra should never be a daily battle. If you’re constantly adjusting, in pain, or uncomfortable, chances are your size is off. The right bra will feel secure, supportive, and comfortable all day long.
So, take a little time to check your fit. Your shoulders, back, and confidence will thank you for it.
Pro tip: Don’t forget that your bra size can change with weight fluctuations, pregnancy, hormonal changes, or even just age. Regularly re-measuring yourself is the best way to stay supported and comfortable.
Amy x
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