So I am 6'1", weigh 205, size 42-44 suit, typically wear a large, sometimes XL depending on brand and cut.
I have Carhartt T-Shirts in size L and they fit perfectly.
This sweatshirt fits like it should except for one area...the waist...either they made it exceptionally large or the design of the waist elastic is poor and does not keep its shape.. The chest, sleeves etc are great but seems like the waist tapers out like the shape of a pear... I had to take it to a seamstress to alter the waist line.
Other than that, I do like it and it's great for the cooler weather.