A US Clothing Size Chart is a standardized guide that helps consumers determine their clothing size based on measurements. Sizes typically range from small (S) to extra-large (XL) for adults, with numerical sizes like 2, 4, 6, and so on. The chart includes measurements for bust, waist, and hips, which vary between brands. Different clothing types, such as men's, women's, and children's apparel, have their own size charts. It's important to refer to the specific chart for the brand you are purchasing, as sizing can differ significantly. Always measure yourself accurately to find the best fit.