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Find the right bra shape and perfect fit from the comfort of your home with our handy guide packed with all the tips and tricks from our in-store lingerie specialists


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Pick from our failsafe bras styles that guarantee to make you look great



Celebrating 90 years
of M&S lingerie

M&S has been selling lingerie since 1926, and today one in three British women buys their bras from M&S (which means a pretty large percentage of you reading this are wearing one right now).

editorCharlene Barton
Womenswear editor

From post-war girdles to the launch of the 90th anniversary bra, discover our journey to becoming the UK’s ultimate underwear destination.


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Retro image of model wearing M&S lingerie

Key fit areas



The underband should be horizontal across your back. It should be snug but with enough room to fit two fingers underneath it



The wires at the front should sit flat at the breastbone between your breasts



Your breasts should be fully enclosed in each cup and there should be a smooth line where the cup ends



The bra straps should be secure, but not tight. If you drop the straps, the bra should stay in the same place


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Ill-fitting cups?

Go up a back size if:

  • Your breasts are spilling out of the cups at the front or under the arms

Go down a back size if:

  • The cups are wrinkling or gaping

Underband riding too high?

Go up a back size if:

  • The breast tissue under your arms is bulging over the underband

Go down a back size if:

  • Your breasts are showing beneath the underband
  • The underband is riding up your back

Straps slipping off?

Loosen your bra straps if:

  • They are digging into your shoulders
  • They feel tight and are causing the cups to dig into your breasts

Tighten your bra straps if:

  • They are slipping off your shoulders
  • If you have narrow shoulders, avoid balcony bras as these have wide-set straps

What about the wires?

Go up a back size if:

  • The wires are digging into your breast tissue
  • The wires are lifting away from your breastbone

Go down a back size if:

  • The wires are slipping down your body, towards your waist