Question 1

Is a 28O the same in every brand?

Accepted Answer

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

Question 2

What are the sister sizes for 28O?

Accepted Answer

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

28O Bras

Your 28O across brands

Tango Balcony Bra - Nutmeg

Tango Balcony Bra - Navy

Envy Full Cup Bra - Terracotta

Tango Balcony Bra - Chai

Envy Full Cup Bra - Chai

Envy Full Cup Bra - Chestnut

Envy Full Cup Bra - Teal

Tango Balcony Bra - Honey

Tango Balcony Bra - Blush

Tango Balcony Bra - Black

Nina Balcony Bra - Black Leopard

Serene Full Cup Bra - Noir

Serene Full Cup Bra - Vintage

Celeste Balcony Bra - Pistachio

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

Brand	How it runs	Your 28O →
ThirdLove	cups run generous	28O
Wacoal	true to size	28O
Panache	true to size	28K
Bravissimo	true to size	28K
Freya	band runs small	28K
Elomi	cups run generous	28K
Glamorise	true to size	28O
SHEFIT	-	Sizes by brand chart
b.tempt'd	true to size	28O
Kindred Bravely	-	Sizes by brand chart
ENELL	-	Sizes by brand chart
Fantasie	true to size	28K