Bra Fitting Guide — How to Get the Right Fit at Home

A good bra fitting means the band sits snug and level, the cups fully contain your bust with no spillage or gaping, and the straps stay in place without digging in. Getting these things right matters more than the number on the label — even a mathematically correct size can still fit badly.

What Makes a Bra Fit Correctly?

Fit comes down to four checkpoints: band, cup, straps and wire. The band should sit level and snug enough to stay put without you adjusting it, since it carries roughly 80% of the support. The cups should fully contain your bust with no gaping at the top or spilling at the sides. Straps should feel secure without digging in, and the wire (if there is one) should sit flat against your ribcage, never on breast tissue.

Signs of a Good Fit vs a Bad Fit

For a full breakdown of what each problem means and exactly how to fix it, read our guide on signs your bra does not fit.

How to Fit a Bra: A Quick Self-Check

1. Fasten the band on the loosest hook and check it's still snug and level.
2. Lean forward, let your bust settle into the cups, then stand up straight.
3. Adjust the straps until they sit comfortably without digging in or slipping.
4. Check the centre gore lies flat against your sternum.
5. Raise your arms and move around — the band shouldn't ride up and the cups shouldn't gape.

Bra Fitting Tips for a Better Fit at Home

You don't need a professional to get a reliable starting size — a soft tape measure and a mirror will get you most of the way there. See our guide on how to measure your bra size at home for the full technique, or use our bra size calculator for an instant result.

Where to Get Measured for a Bra

Most UK department stores and specialist lingerie shops offer free, no-obligation bra fittings — usually a 15–20 minute appointment where a trained fitter checks your band, cup and overall fit in person, often trying two or three sizes to compare. This is a good option if you want a second opinion beyond your calculated result, especially the first time you try a new brand.

Specialty Fitting Situations

Pregnancy, breastfeeding, high-impact sport and first-time fittings all need slightly different approaches to sizing. See our guide to specialty bra size calculators for maternity, nursing, sports, strapless and first-bra advice.

Frequently Asked Questions

How do I know if my bra doesn't fit?

Common signs include the band riding up at the back, cups gaping or spilling over, straps digging in or slipping down, and the underwire poking rather than sitting flat. Any one of these usually means it's time to try a different size.

Is a professional fitting better than measuring at home?

A professional fitting adds a trained eye for details like subtle gaping or wire placement that are harder to judge on yourself. A home measurement is accurate as a starting point, but an in-person check confirms how the bra actually behaves when you move.

How long does a bra fitting appointment take?

Most fittings take 15–20 minutes, including trying on two or three sizes to compare fit. Many UK department stores and lingerie shops offer this as a free service with no obligation to buy.

Should the band or the straps carry most of the support?

The band should do about 80% of the work — that's why a snug, level band matters more than tight straps. If your straps are digging in to compensate for a loose band, you likely need a smaller band size.

What if the cup fits but the band feels loose, or vice versa?

Try a sister size — the same cup volume in a different band-cup combination. A smaller band with a slightly larger cup, or a larger band with a slightly smaller cup, often solves a mismatched fit.