Waist measurements refer to the circumference of the waist, typically taken at the narrowest part of the torso, just above the belly button. This measurement is important for assessing body composition and health risks, as it can indicate levels of body fat and potential issues related to obesity. In clothing, waist measurements are crucial for determining the right fit for garments such as pants and skirts. Different sizing systems, like US sizes or European sizes, may use waist measurements in inches or centimeters, making it essential to know your size for comfortable and flattering clothing choices.