Is a 34I the same in every brand?

No - a 34I isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 34I translates in the brands we track: ThirdLove 34I, Wacoal 34I, Panache 34G, Freya 34G, Elomi 34G, Glamorise 34I, b.tempt'd 34I, Fantasie 34G. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

What are the sister sizes for 34I?

34I's sister sizes — same cup volume, different band — are 32J and 36H. Try a sister size if the band feels too tight or loose but the cup still fits.

34I Bras

What is a 34I in other brands?

529 bras tracked in 34I · 7 brands · See all I cup

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

Your 34I across brands

A 34I isn’t the same in every brand. Here’s how a standard US 34I translates across the brands we track — and how each one runs.

Brand	How it runs	Your 34I →
ThirdLove	cups run generous	34I
Wacoal	true to size	34I
Panache	true to size	34G
Freya	band runs small	34G

What is a 34I in other brands? See all 30+ brands →

Editorial buying guide

Read the 34I buying guide

Top picks, sister sizes, and how to spot a good 34I fit.

Read →

Sister sizes

32J 36H What are sister sizes?

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Your 34I across brands

Sachi Plunge Bra: Black

Morgan Stretch Banded Bra: Dark Romance

Reja Plunge Bra: Black

Nerina Stretch Plunge Bra: Rouge

Zarla Stretch Banded Bra: Sapphire

Namrah Bandless Plunge Bra: Pale Blush

Kintai Plunge Bra: Black

Nina Balcony Bra - Black Leopard

Faith Moulded Plunge Bra - Latte

Faith Moulded Plunge Bra - Noir

Nina Balcony Bra - Mocha

Retro Chic Full Figure Underwire Bra: Toast

Deco U W Moulded Strapless Molded Strapless Bra: Nude

Deco U W Moulded Strapless Molded Strapless Bra: Black

Tailored Molded Strapless Bra: Natural Beige

Tailored Molded Strapless Bra: Black

Rebecca Essentials Spacer Molded Bra: Red

Rebecca Essentials Spacer Molded Bra: Natural Beige

Rebecca Essentials Spacer Molded Bra: Black

Rebecca Essentials Spacer Molded Bra: Blush

Lucie Stretch Plunge Bra: Wildcat

Lucie Stretch Plunge Bra: White

Lucie Stretch Plunge Bra: Pale Blush

Lucie Stretch Plunge Bra: Mocha

Lucie Stretch Plunge Bra: Mist

Lucie Stretch Plunge Bra: Black

Morgan Stretch Banded Bra: White

Morgan Stretch Banded Bra: Sahara

Morgan Stretch Banded Bra: Midnight

Morgan Stretch Banded Bra: Haute Red

Morgan Stretch Banded Bra: Black

Morgan Stretch Banded Bra: Toasted Almond

Morgan Stretch Banded Bra: Hot House

Morgan Stretch Banded Bra: Ebony

Morgan Stretch Banded Bra: Cameo Rose

Tiernie Stretch Plunge Bra: Sahara

Nerina Stretch Plunge Bra: Sahara

Nerina Stretch Plunge Bra: Black

Serene Full Cup Bra - Noir

Florence Balcony Bikini Top - Polka Dot Print

Billie Plunge Bikini Top - Sparkle Teal

Visual Effects Minimizer Bra: Sand

Visual Effects Minimizer Bra: Roebuck

Perfect Primer Full Figure Underwire Bra: White

Perfect Primer Full Figure Underwire Bra: Sand

Perfect Primer Full Figure Underwire Bra: Roebuck

Perfect Primer Full Figure Underwire Bra: Belgian Block

Belle Full Cup Bra: White

Belle Full Cup Bra: Natural Beige

Belle Full Cup Bra: Black

Aura Molded Bra: Natural Beige

Aura Molded Bra: Black

Cesile Side Support Bra: Peach Sorbet

Cesile Side Support Bra: Black

Demure Molded Non Padded Bra: Natural Beige

Demure Molded Non Padded Bra: Black

Emmaline Padded Plunge Bra: Natural Beige

Emmaline Padded Plunge Bra: Midnight

Emmaline Padded Plunge Bra: Blossom

Emmaline Side Support Bra: Natural Beige