European clothing sizes are typically based on the metric system, with numbers representing the measurement in centimeters. For example, a size 38 corresponds to a bust measurement of approximately 86 cm. Sizes can vary between brands, so it's essential to check specific size charts when shopping. In addition to numerical sizes, European clothing often includes letters like S, M, L, and XL to indicate small, medium, large, and extra-large. These letters can help consumers quickly identify their size, but it's still advisable to refer to the brand's size guide for the best fit.