Question 1

Is a 38B the same in every brand?

Accepted Answer

No - a 38B isn't identical across brands, because brands use different sizing systems and cup depths. Here's how a standard US 38B translates in the brands we track: ThirdLove 38B, Wacoal 38B, Panache 38B, Bravissimo 38B, Freya 38B, Elomi 38B, Glamorise 38B, b.tempt'd 38B, Fantasie 38B. SHEFIT, Kindred Bravely, ENELL size by their own chart instead of band/cup.

Question 2

What are the sister sizes for 38B?

Accepted Answer

38B's sister sizes — same cup volume, different band — are 36C and 40A. Try a sister size if the band feels too tight or loose but the cup still fits.

38B Bras

Your 38B across brands

Perfect Primer Wire Free Bra: Sand

How Perfect Wire Free T-Shirt Bra: Sand

How Perfect Wire Free T-Shirt Bra: Black

Vivid Attraction Underwire Bra: White

Vivid Attraction Underwire Bra: Black

Vivid Attraction Underwire Bra: Woodrose

Vivid Attraction Underwire Bra: Dark Purple

Back Appeal® Wire Free Bra: Black

Back Appeal® Wire Free Bra: Rose Dust

Vivid Attraction Underwire Bra: Soft Sky

Deco U W Moulded Strapless Molded Strapless Bra: Nude

Deco U W Moulded Strapless Molded Strapless Bra: Black

Tailored Molded Strapless Bra: Natural Beige

Tailored Molded Strapless Bra: Black

Comfort First Strapless Bra: Roebuck

Vivid Attraction T-Shirt Bra: Black

Vivid Attraction T-Shirt Bra: Woodrose

Vivid Attraction T-Shirt Bra: Dark Purple

Belle Balcony Bra: White

Belle Balcony Bra: Black

Back Appeal® Wire Free T-Shirt Bra: Black

Shape Revelation® Shallow Top Underwire T-Shirt Bra: Praline

Red Carpet™ Strapless Underwire Bra: Black

Red Carpet™ Strapless Underwire Bra: Roebuck

24/7® Classic Unlined Minimizer Bra: Taupe

24/7® Classic Unlined Minimizer Bra: Black

Rose Lace Unlined Demi Bra: Sea-Salt

Brand	How it runs	Your 38B →
ThirdLove	cups run generous	38B
Wacoal	true to size	38B
Panache	true to size	38B
Bravissimo	true to size	38B