Our shirt sizes are measured with EU's standards. Use this chart to convert between standard size formats. Ploumanac'h 38 39 40 41 42 43 44 45 46 International XS S M L XL XXL 3XL 4XL 5XL European Collar (EU) 38 39 40 41 42 43 44 45 46 UK/US Collar 14.5 15 15.5 16 16.5 17 17.5 18 18.5 If you have other questions regarding a product, submit your question to our product advisor. productadvisor@ploumanach.it