Is a 38I the same in every brand?

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

What are the sister sizes for 38I?

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

38I Bras

What is a 38I in other brands?

546 bras tracked in 38I · 7 brands · See all I cup

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

Your 38I across brands

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

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

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

Editorial buying guide

Read the 38I buying guide

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

Read →

Sister sizes

36J 40H What are sister sizes?

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Your 38I across brands

Allure Full Cup Bra - Azure Blue

Bliss Full Cup Bra - Rose Pink

Allure Full Cup Bra - True Red

Allure Full Cup Bra - Honey

Magdalena Side Support Bra: Vintage Green

Magdalena Side Support Bra: Noir

Magdalena Side Support Bra: Natural Beige

Esme Balcony Bra - Mocha Animal

Esme Balcony Bra - Black Animal

Ana Nursing Bra - Vintage

Lauren Plunge Bikini Top - Black

Lauren Plunge Bikini Top - Cobalt

Amara Full Cup Bra - Honey

Amara Full Cup Bra - Black

Lauren Plunge Bikini Top - Red

365 Moulded Strapless Bra - Black

365 Moulded Strapless Bra - Honey

Freedom Non Wired Sports Bra - Black/Chalk

Power Wired Sports Bra - White

Endurance Wired Sports Bra - Black

Power Wired Sports Bra - Latte

Endurance Wired Sports Bra - Dusty Rose

Entice Full Cup Bra - Red

Endurance Wired Sports Bra - Berry/Chalk

Endurance Wired Sports Bra - Sienna Rose

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

Bette Balcony Bikini Top - Teal Blue

Lillia Side Support Bra: White

Magdalena Spacer Molded Bra: Vintage Green

Magdalena Spacer Molded Bra: Noir

Magdalena Spacer Molded Bra: Natural Beige

Magdalena Balconette Bra: Vintage Green

Magdalena Balconette Bra: Noir

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

Portia Side Support Bra: Red

Endurance Wired Sports Bra - Black/Latte

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

Lara Plunge Swimsuit - Aurora Red

Sienna Balcony Tankini Top - Polka Dot Print

Iris Balcony Tankini Top - Red Gingham

Iris Balcony Tankini Top - Black Gingham

Isabella Balcony Swimsuit - Polka Dot Print

Selena Plunge Tankini Top - Cobalt

Paloma Balcony Swimsuit - Red Gingham

Paloma Balcony Swimsuit - Black Gingham

Rita Plunge Swimsuit - Black

Monica Balcony Swimsuit - Liliflora Print