Question 1

Is a 28M the same in every brand?

Accepted Answer

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

Question 2

What are the sister sizes for 28M?

Accepted Answer

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

28M Bras

Your 28M across brands

Envy Full Cup Bra - Fuchsia Pink

Envy Full Cup Bra - Honey

Katherine Nursing Bra - Black

Boundless Non Wired Sports Bra - Black

Boundless Non Wired Sports Bra - Berry/Chalk

Allure Full Cup Bra - Ivory

Allure Full Cup Bra - Black/Latte

Allure Full Cup Bra - Azure Blue

Allure Full Cup Bra - True Red

Allure Full Cup Bra - Honey

Lauren Plunge Bikini Top - Cobalt

Lauren Plunge Bikini Top - Red

Freedom Non Wired Sports Bra - Black/Chalk

Power Wired Sports Bra - White

Endurance Wired Sports Bra - Black

Power Wired Sports Bra - Latte

Endurance Wired Sports Bra - Dusty Rose

Endurance Wired Sports Bra - Berry/Chalk

Endurance Wired Sports Bra - Sienna Rose

Endurance Wired Sports Bra - Black/Latte

Brand	How it runs	Your 28M →
ThirdLove	cups run generous	28M
Wacoal	true to size	28M
Panache	true to size	28J
Bravissimo	true to size	28J