The terms "S, M, L, XL" refer to standard clothing sizes that help consumers choose the right fit. "S" stands for Small, "M" for Medium, "L" for Large, and "XL" for Extra Large. These sizes are commonly used in apparel, including shirts, pants, and dresses, to accommodate different body shapes and measurements. Each size typically corresponds to a range of body measurements, such as chest, waist, and hip sizes. For example, a Small might fit someone with a chest measurement of 34-36 inches, while an Extra Large could fit someone with a chest measurement of 46-48 inches. Understanding these sizes can help shoppers find comfortable and well-fitting clothing.