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

Freya Fancies Longline Bra: Black

Envisage Full Cup Side Support Bra: Evening Blue

Blossom Balcony Bra - Celeste

Tango Edit Balcony Bra - White

Clara Full Cup Bra - Black/Pink

Anya Riva Spot Balcony Swimsuit - Navy/Vanilla

Offbeat Side Support Bra: Rosehip

Offbeat Side Support Bra: Natural Beige

Offbeat Side Support Bra: Black

Cherish Me Molded Plunge Bra: Red Leopard

Laurine Molded Plunge Bra: Raspberry

Tailored High Apex Bra: Natural Beige

Tailored High Apex Bra: Black

Loveland Plunge Bra: Bombshell Black

Smoothing Molded Bra: Nude

Smoothing Molded Bra: Black

Lindsey Side Support Bra: Monochrome

Lucia Side Support Bra: Midnight

Pippa Side Support Bra: Wallflower

Cate Allure Full Cup Banded Bra: Deep Emerald

Kintai Plunge Bra: Blackberry

Anya Riva Balcony Swimsuit - Black

Zero Edge™ Contour Bra: Taupe

Zero Edge™ Contour Bra: Leopard

Zero Edge™ Contour Bra: Black

Custom Control Sports Bra White

Custom Control Sports Bra Black

Custom Control Sports Bra Black/Gray

Monica Balcony Swimsuit - Sicily Print

Heidi High Apex Plunge Bra - Ruby Red

Lara Plunge Swimsuit - Aurora Blue

Monica Balcony Swimsuit - Seersucker Multi

Monica Balcony Swimsuit - Posy Print

Deco Moulded Plunge Molded Plunge Bra: Nude

Deco Moulded Plunge Molded Plunge Bra: Black

Essentially Smooth Molded Balcony Bra: Black

Love Crush Molded Plunge Bra: Aqua Haze

Molded Balcony Bra: Natural Beige

Envisage Full Cup Side Support Bra: Natural Beige

Envisage Full Cup Side Support Bra: Black

Fusion Full Cup Side Support Bra: White

Fusion Full Cup Side Support Bra: Sand

Fusion Full Cup Side Support Bra: Evergreen

Fusion Full Cup Side Support Bra: Black

Fusion Full Cup Side Support Bra: Blush

Illusion Side Support Bra: White

Illusion Side Support Bra: Sky

Illusion Side Support Bra: Navy

Illusion Side Support Bra: Natural Beige

Illusion Side Support Bra: Black

Illusion Side Support Bra: Blush

Smooth Molded Bra: Sahara

Smooth Molded Bra: Midnight

Smooth Molded Bra: Heather

Smooth Molded Bra: Haute Red

Smooth Molded Bra: Clove

Smooth Molded Bra: Black

Cate Full Cup Banded Bra: White

Cate Full Cup Banded Bra: Latte

Cate Full Cup Banded Bra: Hazel