The determination of the lower limits in brassiere sizing involves two primary measurements: band size and cup size. Band size, represented by a numerical value (e.g., 30, 32, 34), refers to the circumference around the torso directly beneath the bust. Cup size, indicated by a letter (e.g., AA, A, B), represents the difference between the underbust measurement and the measurement around the fullest part of the bust. A theoretical minimal configuration exists when the underbust and bust measurements are nearly identical, resulting in a very small cup size, such as an AA.
Understanding the dimensions associated with undergarments is important for proper fit and support. Garments that are appropriately sized contribute to comfort, posture, and overall physical well-being. Historically, brassiere sizing evolved as manufacturers sought to provide more standardized and accurate options beyond simple small, medium, and large designations. The introduction of numbered band sizes and lettered cup sizes allowed for a more tailored approach, addressing a broader range of body types. Properly fitted garments can alleviate discomfort and prevent potential skin irritation or chafing.