Is a 34O the same in every brand?

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

What are the sister sizes for 34O?

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

34O Bras

What is a 34O in other brands?

117 bras tracked in 34O · 3 brands · See all O cup

Brands: Elomi, Freya, Panache

Your 34O across brands

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

Brand	How it runs	Your 34O →
ThirdLove	cups run generous	34O
Wacoal	true to size	34O
Panache	true to size	34K
Bravissimo	true to size	34K

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

Editorial buying guide

Read the 34O buying guide

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

Read →

Sister sizes

36N What are sister sizes?

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Your 34O across brands

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

Serene Full Cup Bra - Noir

Molly Nursing Bra: Cameo Rose

Matilda Plunge Bra: White

Matilda Plunge Bra: Sunset

Matilda Plunge Bra: Pearl Blush

Matilda Plunge Bra: Lunar Blue

Matilda Plunge Bra: Cafe Au Lait

Matilda Plunge Bra: Black

Brianna Plunge Bra: Heather

Brianna Plunge Bra: Black

Energise Sports Bra: Navy Geo

Energise Sports Bra: White

Energise Sports Bra: Nude

Energise Sports Bra: Navy

Energise Sports Bra: Black

Priya Plunge Bra: Vanilla

Priya Plunge Bra: Black

Molly Nursing Bra: Black

Aerith Plunge Bra: Rose

Zarla Stretch Banded Bra: Rose Bud

Zarla Stretch Banded Bra: Cafe Au Lait

Zarla Stretch Banded Bra: Black

Serene Full Cup Bra - Vintage

Celeste Balcony Bra - Pistachio

Cora Balcony Bra - Soft Pink

Envy Full Cup Bra - Ivory

Envy Full Cup Bra - Navy

Envy Full Cup Bra - Black

Envy Full Cup Bra - Fuchsia Pink

Envy Full Cup Bra - Honey

Bliss Full Cup Bra - Hazel

Bliss Full Cup Bra - Noir

Bliss Full Cup Bra - Rose Pink

Amara Full Cup Bra - Honey

Amara Full Cup Bra - Black

Entice Full Cup Bra - Red

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

Estel Full Cup Bra - Honey

Estel Full Cup Bra - Noir

Estel Full Cup Bra - Navy

Iris Balcony Tankini Top - Red Gingham

Iris Balcony Tankini Top - Black Gingham

Paloma Balcony Swimsuit - Red Gingham

Paloma Balcony Swimsuit - Black Gingham