This is a really nice shirt, it's my favorite shirt right now. It comes shipped with creases, but they wash out. I'm kind of thick but my arms aren't long, so I just accept that I want a loose-shirt, I like size L, even though I'm 5'9" and 175lbs. I have no idea what the other reviewer was even talking about XS at 5'11"? Bottom Line, it's true to size - if you want it to be roomy and don't mind the sleeves a bit long, you can get a L and it will shrink some on low heat dryer setting. If you're over 5'10 and up, and over 165 lbs, Large. The style of this shirt is to wear it loose/ relaxed, and it's cotton so it will shrink some. The only issue I have with the shirt is that the collar is maybe a little big ...there is a look to the collar, kinda big and meant to be worn open, it's ok. If the collar were slightly more traditional, maybe with buttons, and there were another button on the shirt, I think it would be perfect for me. I do love the color and material.