34D

34D is a bra size used in many regions’ lingerie sizing systems. In the common US/UK scheme, the number 34 refers to the band measurement around the torso just beneath the bust, measured in inches. The letter D represents the cup size, which roughly corresponds to a bust measurement about four inches larger than the under-bust measurement. Exact cup volume can vary by brand and style.

Measurement and interpretation. To determine size, measure around the ribcage directly under the bust for the band size, then measure around the fullest part of the bust. Subtract the under-bust measurement from the bust measurement. Each inch of difference generally maps to a successive letter: 1 inch = A, 2 inches = B, 3 inches = C, 4 inches = D, 5 inches = DD/E, and so on. This system provides a starting point, but fit can vary with brand, cut, and fabric.

Variations and regional differences. Bra sizing conventions differ by country and brand. A 34D in US sizing is usually similar to UK 34D and European sizing around 75D, but exact equivalents may vary. Brands may also label cups differently or offer half-sizes in some markets.

Sister sizes. For a given volume, adjacent band sizes with adjusted cup letters are considered sister sizes. For 34D, common sister sizes include 32DD and 36C, though availability and fit depend on the brand and style.

Practical notes. The right size should fit snugly on the band with the cups enclosing the breasts fully without gaps or spills. Trial with different brands and styles is common, as shape and support needs vary.