A "29-inch waist" refers to the measurement around the narrowest part of a person's torso, which is typically just above the belly button. This size is often used in clothing sizing, particularly for pants and skirts, indicating a smaller waistline. Individuals with a 29-inch waist may find that they fit into sizes labeled as small or medium in many brands. This measurement can vary based on body shape and style preferences, and it is important to note that clothing sizes can differ between manufacturers.