Is a 38K the same in every brand?

No - a 38K isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 38K translates in the brands we track: ThirdLove 38K, Wacoal 38K, Panache 38H, Freya 38H, Elomi 38H, Glamorise 38K, b.tempt'd 38K, Fantasie 38H. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

What are the sister sizes for 38K?

38K's sister sizes — same cup volume, different band — are 36L and 40J. Try a sister size if the band feels too tight or loose but the cup still fits.

38K Bras

What is a 38K in other brands?

462 bras tracked in 38K · 7 brands · See all K cup

Brands: Bravissimo, Elomi, Fantasie, Freya, Glamorise, Panache, Wacoal

Your 38K across brands

A 38K isn’t the same in every brand. Here’s how a standard US 38K translates across the brands we track — and how each one runs.

Brand	How it runs	Your 38K →
ThirdLove	cups run generous	38K
Wacoal	true to size	38K
Panache	true to size	38H
Freya	band runs small	38H

What is a 38K in other brands? See all 30+ brands →

Editorial buying guide

Read the 38K buying guide

Top picks, sister sizes, and how to spot a good 38K fit.

Read →

Sister sizes

36L 40J What are sister sizes?

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Your 38K across brands

Cora Balcony Bra - Soft Pink

Liberty Plunge Bra - Mocha

Nerina Spacer Molded Bra: Rouge

Envy Full Cup Bra - Ivory

Envy Full Cup Bra - Navy

Envy Full Cup Bra - Black

Jennifer Plunge Bikini Top - Aurora Black/White

Envy Full Cup Bra - Fuchsia Pink

Bette Balcony Bikini Top - Liliflora Print

Envy Full Cup Bra - Honey

Alice Balcony Strapless Bra - Honey

Alice Balcony Strapless Bra - Black

Esi Bra - Navy Floral

Charley Bralette: Black

Charley Bralette: Ballet Pink

Smooth Molded Strapless Bra: Sahara

Smooth Molded Strapless Bra: Black

365 Moulded T Shirt Bra - Black

365 Moulded T Shirt Bra - Honey

365 Moulded T Shirt Bra - Lipstick

365 Moulded Plunge Bra - Honey

Anya Riva Spot Balcony Tankini Top - Navy/Vanilla

Katherine Nursing Bra - Black

Boundless Non Wired Sports Bra - Black

Boundless Non Wired Sports Bra - Berry/Chalk

Allure Spacer T Shirt Bra - Black

Charley Bandless Spacer Molded Bra: Fawn

Charley Bandless Spacer Molded Bra: Black

Charley Bandless Spacer Molded Bra: Ballet Pink

Nerina Spacer Molded Bra: Sahara

Nerina Spacer Molded Bra: Black

Lacey Bra - Black

Nursing Sleep Bra - Navy

Clara Full Cup Bra - Chai

Allure Full Cup Bra - Ivory

Allure Full Cup Bra - Black/Latte

Bliss Full Cup Bra - Hazel

Bliss Full Cup Bra - Noir

Clara Full Cup Bra - Charc/Black

Clara Full Cup Bra - Honey

Allure Full Cup Bra - Azure Blue

Bliss Full Cup Bra - Rose Pink

Allure Full Cup Bra - True Red

Allure Full Cup Bra - Honey

Millie Bra - Cocoa

Millie Bra - Mint

Millie Bra - Ivory

Satine Bra - Champagne

Ultimate Comfort Bra - Burgundy

Ultimate Smoothing Balconette Bra - Blush

Millie Bra - Black

Millie Bra - Bright Blue

Amelia Flourish Bra - Blue Multi

Millie Bra - Neon Coral

Amelia Floral Bra - Multi

Millie Bra - Ivory

Millie Floral Bra - Sage Green

Millie Bra - Purple

Millie Bra - Caramel

Ultimate Comfort Bra - Dusky Blue