38B

38B is a bra size used in many Western lingerie markets. It combines a band size of approximately 38 inches around the torso with a cup size denoted by the letter B. In this system, the cup letter reflects the difference between the bust measurement and the band measurement, with B representing a moderate difference.

Sizing systems vary by region and brand. In the United States and United Kingdom, 38B generally refers to the same numerical band and cup letter, though fit can differ between brands and styles. In continental Europe, sizing is often expressed in centimetres and may be labeled as EU sizes that map differently to the US/UK system, such as EU equivalents depending on the chart. Because of these differences, consumers are advised to consult a brand’s size chart and to consider sister sizes (for example, 36C or 40A) if a desired cup volume is not available in 38B.

Fitting and measurement guidance emphasize that a well-fitting 38B should have a snug but comfortable band that stays level around the back, with cups that fully encase the breasts without bulging or gaps. Straps should support the weight without digging into the shoulders. For accurate results, measurements are typically taken around the underbust for the band and around the fullest part of the bust for the cup, and trials across brands and styles are common because cup volumes vary by design.