What are the sister sizes of 38B?

36C and 40A — same cup volume, different band.

Is 38B the same in every brand?

No. A 38B can fit differently between brands because of pattern, fabric and cup shape. Use it as a starting point and try a sister size when switching brands.

38B bra size — conversion chart, sister sizes & brands

A 38B bra (US notation) in every regional standard. The same band-and-cup, labelled eight different ways.

US	UK	EU	FR	IT	AU	JP	IN
38B	38B	85B	100B	85B	16B	85B	38B

Band conversions are exact; cup fit still varies by brand, style, and body — a conversion is a starting point, not a guarantee.

Sister sizes of 38B

Sister sizes hold the same cup volume with a different band — the quickest fix when a band feels too tight or too loose.

36C 40A

Not sure you're a 38B? Two measurements, two minutes — free, nothing stored.

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Brands that make B-cup bras

38B FAQ

What is 38B in EU sizing?: 38B (US) is EU 85B. In UK sizing it is 38B. Band conversions are exact; cup fit still varies by brand, style, and body — a conversion is a starting point, not a guarantee.
What are the sister sizes of 38B?: 36C and 40A — same cup volume, different band.
Is 38B the same in every brand?: No. A 38B can fit differently between brands because of pattern, fabric and cup shape. Use it as a starting point and try a sister size when switching brands.