Is a 28I the same in every brand?

No - a 28I isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 28I translates in the brands we track: ThirdLove 28I, Wacoal 28I, Panache 28G, Freya 28G, Elomi 28G, Glamorise 28I, b.tempt'd 28I, Fantasie 28G. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

What are the sister sizes for 28I?

28I's sister sizes — same cup volume, different band — are 30H. Try a sister size if the band feels too tight or loose but the cup still fits.

28I Bras

What is a 28I in other brands?

181 bras tracked in 28I · 2 brands · See all I cup

Brands: Freya, Panache

Your 28I across brands

A 28I isn’t the same in every brand. Here’s how a standard US 28I translates across the brands we track — and how each one runs.

Brand	How it runs	Your 28I →
ThirdLove	cups run generous	28I
Wacoal	true to size	28I
Panache	true to size	28G
Freya	band runs small	28G

What is a 28I in other brands? See all 30+ brands →

Editorial buying guide

Read the 28I buying guide

Top picks, sister sizes, and how to spot a good 28I fit.

Read →

Sister sizes

30H What are sister sizes?

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Panache

Tango Essence Balcony Bra - Honey

$62.00

Your 28I across brands

Tango Essence Balcony Bra - Honey

Tango Essence Balcony Bra - Black

Cherish Me Plunge Bra: Red Leopard

Freya Fancies Plunge Bra: White

Freya Fancies Plunge Bra: Natural Beige

Freya Fancies Plunge Bra: Black

Blossom Balcony Bra - Taupe

Blossom Balcony Bra - Black

Offbeat Padded Half Cup Bra: Black

Offbeat Plunge Bra: Rosehip

Starlight Side Support Balcony Bra: Caramel

Starlight Side Support Balcony Bra: Black

Viva Side Support Bra: Lace Natural Beige

Offbeat Plunge Bra: Black

Posie High Apex Bra: White

Entwined Plunge Bra: Daisy

Laurine Plunge Bra: Raspberry

Love Crush Plunge Bra: Aqua Haze

Fascinate Molded Plunge Bra: White

Fascinate Molded Plunge Bra: Cherry

Tailored High Apex Bra: Dark Sapphire

Loveland Plunge Bra: Bombshell Teal

Freya Fancies Longline Bra: White

Freya Fancies Longline Bra: Black

Blossom Balcony Bra - Celeste

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

Heidi High Apex Plunge Bra - Ruby Red

Deco Moulded Plunge Molded Plunge Bra: Nude

Deco Moulded Plunge Molded Plunge Bra: Black

Essentially Smooth Molded Balcony Bra: Cameo

Essentially Smooth Molded Balcony Bra: Black

Love Crush Molded Plunge Bra: Aqua Haze

Molded Balcony Bra: Natural Beige

Rocha Non Wired Bra - Misty Rose

Tango Balcony Bra - Honey

Tango Balcony Bra - Blush

Tango Balcony Bra - Black

Allure Demi Plunge Bra - Black/Latte

Rocha Non Wired Bra - Black

Offbeat Molded Bra: Rosehip

Tailored Molded Plunge Bra: Dark Sapphire

Loveland Molded Spacer Bra: Bombshell Teal

Starlight Molded Bra: Rosewater

Starlight Molded Bra: Caramel

Starlight Molded Bra: Black

Idol Molded Balcony Bra: Coffee Roast

Idol Molded Balcony Bra: Cinnamon

Quinn Molded Spacer Bra: Cameo

Quinn Molded Spacer Bra: Black

Posie Longline Bra: White

Tailored Molded Plunge Bra: Natural Beige

Tailored Molded Plunge Bra: Black

Loveland Molded Spacer Bra: Bombshell Black