All Porsche Driver's Selection clothing (with very few exceptions) is labeled and identified in Manufacturers Product Number with European sizing. This sizing is always 1 size larger then US. Label or tag on the actual clothing will often list both EU and US sizing, e.g. EU L - US M. Many Porsche customers already know this however if you're new to brand you may not know. For this reason always specify in our product listing that you're choosing Sizing Standard - EU.