Ambivalence and the many other. DO yourself a HUGE favor. Go to your local tailor and get measured. You simply can't go by other companies shirt sizing everyone is different . The additional room needed in a shirt differs from company to company. Your chest size is only one component to a great fitting shirt. You need to know several other measurements as well. Neck yoke sleeve length chest Should slope Bicep natural waist Coat waist Tail length I have a 39/40 chest. My shirts measure a 42 and it pulls a tad and it's not just because of my god like physique.