If you usually wear size Large, order an XLarge.6This was supposed to be a birthday gift for my big bro who took off a size Large jersey to try this on. It was the smallest Large ever, almost like an Medium on him. It was even too tight to wear as a compression-style fit. I can't return it so I'll have to re-order a size up.I can actually modify it for myself because I sew and it's not that far off MY size. I am much, much smaller than my bro.