I purchased the dark olive green shirt after purchasing 2 of the plaid shirts last year. The solid color shirt is a slightly different fabric that is a bit softer and has a little stretch in it. I really like both fabrics, just wanted to note the difference. I am 5'8 190lbs and bought an XL and it fits as expected, just like the plaid shirts. I roll up the sleeves. It's very comfortable and perfect for wearing on work calls. I also throw these on with leggings and because I am shorter, it is long enough to cover my bum. These shirts have become my go to shirts when I want to wear something nicer than a t-shirt but still be comfortable and casual. I plan to buy a few more to add to my rotation.