How Should a Bra Fit?

Put the bra on properly first

A fit check only means something if the bra is on correctly. Two steps make the difference.

1. Fasten a new bra on the loosest hook. Slip the straps on, lean forward slightly and settle your breasts into the cups.
2. Scoop and swoop. With the opposite hand, reach into each cup, gather the tissue from under your arm and bring it forward and up into the cup. This step regularly turns a bra that seemed to fit into one that is plainly a cup too small. The full technique is in the scoop and swoop method.

Then adjust the straps so they lie flat, and look in a mirror from the front and from the side.

1. The band

The band is the foundation. Fitters commonly say it provides most of a bra's support, with the straps contributing only a little, and the fit check starts here because a wrong band makes every other part behave badly.

What a good fit looks like

• It runs level around your body, at the same height at the back as at the front.
• It feels firm and secure, and you can still slide two fingers underneath at the back.
• It stays where it is when you lift your arms above your head.

What goes wrong

A band that arches up between your shoulder blades is too big, which is the single most common fit problem. See why your bra rides up at the back. A band that hurts, restricts your breathing or leaves deep grooves is too small, though it is worth ruling out small cups first: is my bra band too tight?

2. The cups

What a good fit looks like

• All of your breast tissue is inside the cup, at the front and at the sides.
• The top edge lies against you in a smooth line, with no bulge above it and no gap behind it.
• The fabric is smooth, without wrinkles or empty space.

What goes wrong

Tissue bulging over the top or out at the sides means the cup is too small. That is covered in spilling out of your bra cups. Loose fabric or a gap at the top edge may mean the cup is too big, but just as often it means the cup is the wrong shape for you: see why your bra cups are gaping.

3. The centre gore

The gore is the small panel between the cups. In an underwired bra it should sit flat against your breastbone, touching the skin. Fitters call this "tacking".

If the gore floats away from your chest, the cups are usually too small or too shallow. Your breasts are filling the cups and pushing the whole front of the bra outwards. Going up a cup size normally brings the gore back to the chest.

There are exceptions. Non-wired bras and soft bralettes are not designed to tack. And if your breasts sit very close together, a tall gore may rest on tissue however good the size is, in which case a plunge style with a low, narrow gore will suit you better.

4. The underwires

What a good fit looks like

• The wire follows the crease where your breast meets your chest, all the way round.
• At the side it ends on your ribcage, behind the breast tissue, pointing roughly towards the middle of your armpit.
• Pressing gently on the wire, you feel rib underneath it, never soft tissue.

What goes wrong

A wire resting on breast tissue at the side means the cup is too small or too narrow. A wire that pokes into your armpit is too wide or too tall for your frame. A wire digging into your ribs at the front often comes with a band that is riding up at the back, which tilts the front of the bra downwards.

5. The straps

Straps keep the top of the cup against your body. They are not meant to do the lifting.

• They stay on your shoulders without slipping.
• You can slide two fingers underneath.
• They leave no deep grooves.

Here is a quick test. Slip both straps off your shoulders. If the bra stays more or less in place and your breasts stay supported, the band is doing its job. If everything drops, the band is too loose and the straps have been compensating, which is the usual cause of shoulder grooves.

Check it in motion

Standing still in a fitting room is the easiest test a bra will ever face. Before deciding:

• Raise both arms above your head. The band should not lift, and nothing should slip out beneath the cups.
• Lean forward. You should stay inside the cups.
• Twist from side to side and sit down. The wires should not jab and the band should not roll.
• Put a fitted T-shirt on over the top. You should see one smooth line.

How it should feel

If you have worn loose bands for years, a correctly fitted bra will feel noticeably firmer around the ribs for the first few days. That is normal and settles quickly. It should feel secure. It should never feel painful, pinch, or make breathing harder.

Unfamiliar with a term on this page? Bra measurements explained is a short glossary.

After that adjustment, the best sign of a good fit is that you stop noticing the bra. You are not hitching straps, pulling the band down or tucking yourself back in during the day.

Sports bras follow the same principles with a few extra tests, covered alongside the sports bra calculator.

If something is wrong, change one thing at a time

• Band wrong, cups right: move to a sister size, which changes the band and keeps the cup volume. The sister size chart shows which one.
• Cups wrong, band right: keep the band and move one cup letter up or down.
• Size seems right but it still does not sit well: the style probably does not match your shape. Try a different cut, such as a balconette in place of a plunge, before changing size again. The breast shapes guide explains which cuts suit which shapes.

For a symptom-by-symptom guide to each problem, go to signs your bra doesn't fit. To take these checks shopping, use the bra fitting checklist.

Frequently asked questions

Should a new bra fit on the loosest or tightest hook?

The loosest. Bands stretch as they are worn and washed, and the tighter hooks are there so you can take up that slack over the life of the bra. A bra that only fits on the tightest hook when new has nowhere left to go.

Is it normal for a bra to leave marks?

Light marks that fade within a few minutes of taking the bra off are normal, in the same way sock elastic leaves a mark. Deep grooves, broken skin, or marks that are sore or last a long time mean something is too tight or sitting in the wrong place.

Does the centre of the bra always have to sit flat?

In an underwired bra, yes: the centre panel should rest against your breastbone. Non-wired bras and bralettes are built differently and often do not sit completely flat, which is fine.

How do I know if my cups are too small or my band too big?

They often happen together and can feel similar. Fasten the bra around your waist with the cups at the back. If the band feels comfortable there but tight when worn normally, the cups are too small and are pushing the bra away from your body.