You shouldn’t over tighten your straps to achieve the uplift you crave. 80% of the support in a bra comes from a well-fitting underband - not the straps.

If your underband rides up, or if you can pull it more than an inch from your back, then it's time to size down!

The centre front of your bra should sit flat against your ribcage. If you have a gap, try a larger cup size.
The underband should sit firmly around your ribcage, level at the front and back and parallel to the ground.

The correct band size will sit snugly and not move whether you raise your arms up or have them by your side. Try lifting your arms, if your underband is lifting away from your chest, your band size is too big.

The correct cup size will give you an even, rounded shape. The underwire should extend fully behind your breast tissue.

There should be no bulge or squashing under the arm and no dreaded quad-boob in sight! If you’re spilling out of your cup a little or a lot, try a bigger cup size.