How to Buy a Bra That Fits

Wearing the right-size bra is important whatever your bust size. An ill-fitting bra can cause back and neck pain and poor posture, not to mention painful rubbing and chafing (hands up, is there anything worse?). Giving your breasts the right support is not only vital for comfort, but for general wellbeing, too. Getting measured shouldn't be a one-off either, as your breasts can fluctuate in size thanks to hormonal changes during puberty, pregnancy, or the menopause, so it's worth doing regularly. Our in-store and online Bra Fit service has instant appointments available, or you can use the booking system to choose a more convenient time.

If you have a smaller bust, you might think you don't need quite as much support as those who wear an E-cup or above, but getting the fit right is just as important – not only for comfort, but to prevent any premature sagging. Choose a bra style designed to flatter your shape. “For women with smaller busts, we have a range of bralettes, crop tops, non-wired and wired bras, in cup sizes A to E, so every customer will find a style to suit,” says M&S bra technologist Stephanie Dear.

One of the most transformative times for your body is during pregnancy. Breasts become larger and much more tender in the first few weeks, so it's essential that you get measured and start wearing a suitably supportive (and comfortable) bra as soon as possible. Breasts also can grow again after your baby is born and breastfeeding begins.

“We advise all women to be fitted regularly during pregnancy to make sure they are wearing the right-size bra as their breasts develop,” says Stephanie. “Switch to non-wired bras, as underwiring can put pressure on milk ducts – unless the wiring has been specially designed for pregnancy and nursing. If you're planning to breastfeed, book a fitting during the last trimester to choose a nursing bra.”