Is a 42B the same in every brand?

No - a 42B isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 42B translates in the brands we track: ThirdLove 42B, Wacoal 42B, Panache 42B, Freya 42B, Elomi 42B, Glamorise 42B, b.tempt'd 42B, Fantasie 42B. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

What are the sister sizes for 42B?

42B's sister sizes — same cup volume, different band — are 40C and 44A. Try a sister size if the band feels too tight or loose but the cup still fits.

42B Bras

What is a 42B in other brands?

110 bras tracked in 42B · 3 brands · See all B cup

Brands: Elomi, Glamorise, ThirdLove

Your 42B across brands

A 42B isn’t the same in every brand. Here’s how a standard US 42B translates across the brands we track — and how each one runs.

Brand	How it runs	Your 42B →
ThirdLove	cups run generous	42B
Wacoal	true to size	42B
Panache	true to size	42B
Freya	band runs small	42B

What is a 42B in other brands? See all 30+ brands →

Sister sizes

40C 44A What are sister sizes?

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Your 42B across brands

MagicLift Cotton Support Bra Black

Front-Closure Lacey T-Back WonderWire Bra Solid Black

Front-Closure Lacey T-Back WonderWire Bra Black Plum

Front-Closure Lacey T-Back WonderWire Bra Black

Front-Closure Cotton WonderWire Bra Silver

Front-Closure Cotton WonderWire Bra White

Front-Closure Cotton WonderWire Bra Cafe

Low Cut WonderWire Lace Bra Cafe

Low Cut WonderWire Lace Bra Black

MagicLift Seamless Firm Support Bra White

MagicLift Seamless Firm Support Bra Cafe

MagicLift Seamless Firm Support Bra Black

24/7® Classic T-Shirt Bra: Soft-Pink

24/7® Classic T-Shirt Bra: Sienna

24/7® Classic T-Shirt Bra: Mocha

24/7® Classic T-Shirt Bra: Espresso

24/7® Classic T-Shirt Bra: Black

Kinetic Adjustable Sports Bra: Black

24/7® Classic T-Shirt Bra: Taupe

Thermoregulating TempSync™ T-Shirt Bra: Air

Kinetic Adjustable Sports Bra: Sea-Salt

Custom Control Sports Bra White

Custom Control Sports Bra Black

Custom Control Sports Bra Black/Gray

Cate Non Wired Soft Cup Bra: Latte

Cate Non Wired Soft Cup Bra: White

Cate Non Wired Soft Cup Bra: Black

Rose Lace Unlined Demi Bra: Red

ComfortStretch Front Close T-Shirt Bra: Black

ComfortStretch Smoothing Full Coverage Bra: Black

ComfortStretch Back Smoothing T-Shirt Bra: Taupe

ComfortStretch Back Smoothing T-Shirt Bra: Black

All Day Lace T-Shirt Bra: Black

Thermoregulating TempSync™ T-Shirt Bra: Mocha

Thermoregulating TempSync™ T-Shirt Bra: Macaron

ComfortStretch Back Smoothing T-Shirt Bra: Petal

ComfortStretch Smoothing Full Coverage Bra: Petal

All Day Lace Uplift Plunge Bra: Black

All Day Lace T-Shirt Bra: Taupe

ComfortStretch Smoothing Full Coverage Bra: Taupe

Thermoregulating TempSync™ T-Shirt Bra: Taupe

Thermoregulating TempSync™ T-Shirt Bra: Black

ComfortStretch Front Close T-Shirt Bra: Taupe

ComfortStretch Smoothing Full Coverage Bra: Dreamy-Lilac

All Day Lace Uplift Plunge Bra: Sea-Salt

High Impact Underwire Sports Bra Cafe

High Impact Underwire Sports Bra Black

24/7® Classic Unlined Minimizer Bra: Taupe

24/7® Classic Unlined Minimizer Bra: Black

Rose Lace Unlined Demi Bra: Sea-Salt