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Bra Fit Guide

Bra Fit Guide

Follow our Bra Fit Guide To Get The Best Fit From Your Bra

We’ve put together this bra fit guide as many women will never have had a bra fitting.

Even if they have they may have very little knowledge of how a bra should fit.

We’ve put this guide together to dispel some myths and help you to get a better fitting bra.

When we ask ladies what makes a good fitting bra we always receive a range of answers.

From, “One that is comfy” to ” A bra that lifts my boobs.”

“One with straps that don’t slip” “One that the underwires don’t come out of”

“One that makes me look smaller” “A bra that doesn’t dig in”

Due to there being many things that go into making a good bra there can be just as many issues for ladies if they don’t understand how a bra works.

So we’ll start with the key points to finding a good fitting bra.

Firstly the back of the bra should sit across the back in a straight line at the bottom of your shoulder blades:

  • The back should be level front and back.
  • If you stand sideways and look in the mirror, your bra should be level all the way around your body.

Secondly, breasts start under the armpit and extend up onto the chest:

  • Bra cups need to cover all of this in order to fit and support properly.
  • If wearing an underwired bra, the underwires should sit at the side of the body in line with the underarm.
  • Most of the fleshy underarm area should be covered by the fabric of the bra.
  • The cups of the bra should sit flush with the skin on the top of the breasts.
  • The breasts shouldn’t overflow the cups.

Thirdly the straps:

  • Shoulder straps on a bra should be adjusted so that you can comfortably fit two fingers beneath them.
  • You shouldn’t be able to pull them too far from the body and they shouldn’t be so tight that they dig into the shoulders.

Finally the back fastening:

  • When wearing a new bra the back should be fastened on the loosest hook.

The whys and wherefores of bra fitting

The back should be level front and back:

  • The band of the bra should take 90% of the weight of the bust.
  • It’s the band that does the hard work.
  • If it’s too loose it will ride up in the middle.
  • This then means that the weight of the breasts will pull the front of the bra down giving a saggy appearance to the bust.
  • If the band is firm it will hold to the body and lift the breasts up.
  • A firm band will also stop any movement of the bra lessening the need to adjust it throughout the day.
  • It’s this firm fit that will stop the band of the bra from rubbing against the body.
  • This will also help to stop the wires from twisting and poking through the fabric.

Bra cups need to cover the whole of the breast area:

  • As breast tissue starts beneath the armpits this area should be covered by the fabric of the bra.
  • This support is as essential as the center of the breast for support and comfort.
  • The underwires should sit against the rib cage at the sides.
  • Test this by pressing against the wires, if the breast moves then the cup size should be increased to move the wires further away from the breasts.
  • The top edge of the bra should sit against the skin, not digging in nor lifting away.
  • If you find that you overflow the cup or double boob then you should try a bigger cup size to support the top of the breasts.

Shoulder straps should not be relied on for support:

  • The straps on a bra should only give 10% of the support.
  • If the band of the bra is fitted correctly you should be able to slide the straps off without the bust dropping or moving.
  • We recommend having the straps so that you can fit two fingers beneath the band comfortably.
  • If they are too tight they will dig into the shoulders causing irritation and back and neck pain.
  • Too tight and they will also pull the back of the bra up if it’s loosely fitted. You may also find that it pulls the front up exposing the underside of the breasts.
  • Too loose and the straps will constantly fall off the shoulders causing you to have to adjust them all the time.

Back fastening adjustment:

  • New bras should always be fastened on the loosest hook first so that as the bra stretches out it can be tightened up.
  • This means that you can get the maximum amount of use out of the bra.
  • If tightened on the tightest hook there’s no adjustment in the bra.
  • Many ladies believe that by tightening the bra to start with they can loosen it if they put weight on.
  • This rarely works as weight gain often occurs both on the body and breasts.
  • By loosening the bra you’ll also loose support on the cups causing the bust to sag


If you follow this bra fit guide it’s really quite easy to get bra fitting right.

Using this guide it’s possible to assess how your current bras fit and to see where you might make changes.

If ordering bras online it would be worth ordering several sizes to compare.

Check out our bra advice and fitting tips page for more info.

See our bra measuring guide if you’re still not sure what size you need to order.

When you have a rough idea of a size you can use our Sister Size guide to see which bra sizes to compare when ordering multiple sizes.