
Just like someone mentioned here, you definitely need to go 2 up. I wear a large and based on what someone said here I ordered XXL and of course it fits as big as it would.

Van Heusen Traveler Stretch Men's Shirt
47 Review

INFLATION Bamboo Shirts Sleeve Elastic Men's Clothing in Shirts
45 Review

Men'S Long Sleeve Polo Shirt - Slim Fit, Stretchy, Breathable Collar
43 Review

H2H Mens Casual Slim Fit Short Sleeve T-Shirts Cotton Blended Soft Lightweight V-Neck/Crew-Neck
46 Review