Question 1

Is a 42K the same in every brand?

Accepted Answer

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

Question 2

What are the sister sizes for 42K?

Accepted Answer

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

42K Bras

Your 42K across brands

Nerina Spacer Molded Bra: Dusty Rose

Nerina Spacer Molded Bra: Black

Bliss Full Cup Bra - Hazel

Bliss Full Cup Bra - Noir

Bliss Full Cup Bra - Rose Pink

Esme Balcony Bra - Mocha Animal

Esme Balcony Bra - Black Animal

Amara Full Cup Bra - Honey

Amara Full Cup Bra - Black

Entice Full Cup Bra - Red

Back Appeal® H-K Cup Underwire Bra: Black

Back Appeal® H-K Cup Underwire Bra: Rose Dust

Back Appeal® H-K Cup Wire Free Bra: Black

Back Appeal® H-K Cup Wire Free Bra: Rose Dust

Muse Plunge Bra - Cameo Rose

Muse Plunge Bra - Black

Sophia Full Cup Bra - Teal Blue

Sophia Full Cup Bra - Sienna Rose

Sophia Full Cup Bra - Black

Dana Balcony Strapless Bra - Linen

Dana Balcony Strapless Bra - Black

Dana Strapless Balcony Bra - Caramel

Estel Full Cup Bra - Honey

Estel Full Cup Bra - Noir

Estel Full Cup Bra - Navy

Dana Balcony Strapless Bra - Hazel

Brand	How it runs	Your 42K →
ThirdLove	cups run generous	42K
Wacoal	true to size	42K
Panache	true to size	42H
Bravissimo	true to size	42H