Bras cup B

A B cup is an approximate 14-centimeter difference between the bust circumference and the underbust circumference. It is one of the most frequently purchased sizes in Poland. In practice, the letter describes the difference in circumferences, not the absolute size of the breasts: the same cup size for a 70 and 90 circumference means a completely different volume.

Most styles work well for a B cup: padded for fitted clothes, balconette for wide necklines, soft for everyday wear. If the cup wrinkles at the top, check the same underbust circumference with an A cup; if the breast spills out at the top, move to a C cup.

Check your size with two measurements: measure your underbust circumference tightly, on an exhale, and your bust circumference loosely, at the widest point. The difference indicates the letter, the underbust circumference - the number. Each size corresponds to sister sizes: the same breast also fits into an underbust circumference one size smaller with a higher letter and an underbust circumference one size larger with a lower letter. If your size is temporarily unavailable in a particular model, this is the first place to look.

The band under the bust should lie horizontally and allow two fingers to be pulled away from it, the underwire should lie on the ribs, not on the breast, and the straps should not leave marks. Wash in a laundry bag at 30 degrees, fastened, and dry flat. Free delivery from PLN 199, returns within 14 days.

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  • Biustonosz bardotka push-up z mikrofibry 1580 Sielei, beżowy
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    Sielei

    Biustonosz bardotka push-up z mikrofibry 1580 Sielei, beżowy

    Biustonosz bardotka push-up z mikrofibry 1580 Sielei, beżowy

    97,53 zł

    4 rozmiary

  • Delice Sielei – padded lace bra in black
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    Sielei

    Delice Sielei – padded lace bra in black

    Delice Sielei – padded lace bra in black

    127,13 zł

    4 rozmiary

  • Sielei 2452 Padded Beige Bra with Lace Band
    Plus sizes

    Sielei

    Sielei 2452 Padded Beige Bra with Lace Band

    Sielei 2452 Padded Beige Bra with Lace Band

    130,46 zł

    4 rozmiary

  • Biustonosz push-up z koronkowymi miskami DB-9222 Agio beżowy
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    Agio

    Biustonosz push-up z koronkowymi miskami DB-9222 Agio beżowy

    Biustonosz push-up z koronkowymi miskami DB-9222 Agio beżowy

    172,60 zł

    3 rozmiary

  • Komplet bielizny Sielei Delice, czarny biustonosz z brazylianami, koronka i fiszbiny
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    Sielei

    Komplet bielizny Sielei Delice, czarny biustonosz z brazylianami, koronka i fiszbiny

    Komplet bielizny Sielei Delice, czarny biustonosz z brazylianami, koronka i fiszbiny

    99,99 zł

    2 rozmiary

  • Biustonosz gładki push-up z żelową wkładką DB-9214 Agio, beżowy
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    Agio

    Biustonosz gładki push-up z żelową wkładką DB-9214 Agio, beżowy

    Biustonosz gładki push-up z żelową wkładką DB-9214 Agio, beżowy

    163,08 zł

    3 rozmiary

  • Selene Cloe azure jacquard lace bra

    Selene

    Selene Cloe azure jacquard lace bra

    Selene Cloe azure jacquard lace bra

    99,98 zł

    3 rozmiary

  • Biustonosz damski koronkowy półusztywniany DB-9331 Agio, z miseczką Spacer, kremowy
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    Agio

    Biustonosz damski koronkowy półusztywniany DB-9331 Agio, z miseczką Spacer, kremowy

    Biustonosz damski koronkowy półusztywniany DB-9331 Agio, z miseczką Spacer, kremowy

    199,19 zł

    2 rozmiary

  • 3667 Cocktail Lormar - red push-up balconette bra
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    Lormar

    3667 Cocktail Lormar - red push-up balconette bra

    3667 Cocktail Lormar - red push-up balconette bra

    114,76 zł

    2 rozmiary

  • Lormar Mousse 1192 soft white microfiber bra
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    Lormar

    Lormar Mousse 1192 soft white microfiber bra

    Lormar Mousse 1192 soft white microfiber bra

    65,39 zł

    2 rozmiary

  • Sielei Fantastic 1368 Smooth Push-Up Bra White
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    Sielei

    Sielei Fantastic 1368 Smooth Push-Up Bra White

    Sielei Fantastic 1368 Smooth Push-Up Bra White

    97,63 zł

    Ostatni rozmiar: 90B

  • Lormar Mousse 1192 soft microfiber bra in beige
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    Lormar

    Lormar Mousse 1192 soft microfiber bra in beige

    Lormar Mousse 1192 soft microfiber bra in beige

    75,99 zł

    Rozmiar: 70B

What to look out for

In practice the letter describes the difference between two measurements, not the absolute size of the breast: the same cup on a 70 band and on a 90 band is a completely different volume.

What else is worth checking

Most styles work well in a B cup: moulded under fitted clothes, balconettes under wide necklines, soft-cup for every day. If the cup wrinkles at the top, try the same band in an A; if the breast spills over the top, move up to a C.

Fabrics and comfort

Check your size with two measurements: take the underbust measurement firmly, breathing out, and the bust measurement loosely, at its widest point. The difference gives the letter, the underbust measurement - the number. Every size has its sister sizes: the same bust also fits one band smaller with the next letter up, and one band larger with the next letter down. If your size is temporarily unavailable in a particular model, that is the first place worth looking.

Delivery and returns

The underbust band should sit horizontal and pull away about two fingers, the underwire should rest on the ribs and not on the breast, and the straps should not leave marks. Wash in a laundry bag at 30°C with the hooks done up, and dry flat. Orders over PLN 199 ship free, and you have 14 days to return your order.

The letter B corresponds to the bust measurement exceeding the band measurement by 13-15 cm. We have gathered models in this letter in every band size we stock, so that styles can be compared without keeping an eye on the band number.

Remember that the letter on its own says nothing about breast size - a B on a 70 band is a completely different volume from a B on a 95 band. That is why changing the band means adjusting the letter as well: going one band down means going one letter up.

You will find specific numbers in the size collections, for example 75B and 85B. Before you decide, measure yourself and check the numbers against the size guide.

At this volume it is usually the shape of the cup that decides, not its capacity. A cup moulded from a single piece of foam gives a smooth, predictable line under clothes and works well under knitwear. A seamed cup sits more naturally. A push-up moves volume down and in, while a non-wired model keeps the natural shape and is the most comfortable at home.

One more tip: in this letter it is particularly easy to confuse fit with style. If the cup is right at the bottom but wrinkles at the top, the problem is the cut, not the size - simply move from a full cup model to a balconette or a half cup.

Frequently asked questions

How many centimetres of difference does a B cup mean?

Around 13-15 cm between the bust measurement and the underbust measurement.

Is a B cup always the same volume?

No. On a larger band the same letter corresponds to a larger cup volume.

Which style should I choose in a B cup?

For a smooth line under clothes - a moulded cup; for a natural shape - a seamed cup or a non-wired model.

How do I change size when the band is too loose?

Drop one band size and choose one letter up, in other words the sister size.