If you know your size but you're unsure of what styles will suit, there are a few basic rules to arm yourself with. Triangle and non-wired styles are easier for A-C cups as they usually don't provide a huge amount of support. Padded styles will give a fuller shape, while unlined bras create a more natural-looking silhouette. Finally, there's a big difference between balconette and high-apex cups, so pay attention to your breast shape and zoom in on product detailing for a good indication of whether something will suit.

Buying bras online isn't the easiest, as sizes differ between brands. However, if you're keen to avoid schlepping to the high street, fret not. Plenty of retailers offer an online bra-fitting consultation or you can suss things out for yourself using a measuring tape and M&S' guide.