The band size is the most important factor in determining your correct bra size. In fact, the underband does most of the work in supporting your chest!

The most common mistake is wearing a bra in which the band is too large. You can avoid this by following our fit advice.

1. The underband should fit snuggly around the centre of your back. If it rides up, try going down a band size and up a cup size. (If the cup fits, you need to go down a band size and up a cup size for the same cup fit. We call this cross-sizing, see more details below.)

If the band feels too tight, try wearing it on a looser hook or going up a band size and down a cup size.
Remember, the underband is holding about 80% of the weight of your bust, so this part is very important.

2. The wires should sit flat on your rib cage and encase the soft breast tissue. If the wires sit on top of the breast tissue or dig in at the sides, you should try a larger cup size.

3. Do your breasts sit nicely inside the cups or spill out on top? My tip: Put on a T-shirt and check if the bra neckline is digging into your chest. If that is the case, try a larger cup size.

4. Does the centre front of the bra (the bit between the cups) sit flat against the chest? It doesn't have to lay flat perfectly but if it gapes away more than 1 cm, try a larger cup size.

5. Adjusting the straps can make a big difference in the overall fit. Try loosening or tightening them, if necessary. But don't tighten too much; the straps should not dig into your shoulders! You should still get 2 fingers between your strap and shoulder.