US Size 48 typically refers to men's clothing, particularly jackets and suits. It indicates a chest measurement of 48 inches, which is generally suited for individuals with a larger build. This size is part of a standard sizing system used in the United States, where sizes can vary between brands and styles. In addition to jackets, US Size 48 can also apply to other garments like shirts and coats. When shopping, it's important to consider the fit, as different manufacturers may have slight variations in their sizing. Always check the specific size chart for the brand to ensure the best fit.