US size 0 is a clothing size that typically corresponds to a bust measurement of 31-32 inches, a waist measurement of 23-24 inches, and hip measurements of 33-34 inches. It is often considered the smallest standard size in women's clothing in the United States. This size is commonly found in various types of apparel, including dresses, pants, and tops. Different brands may have slight variations in their sizing, so a size 0 in one brand may not fit the same as a size 0 in another. Understanding these differences is important for accurate fitting.