I bought one shirt on Amazon before coming to the &collar web site and buying 8 more. They're easily the best collared shirts for me as a square framed guy who can't stand the cleaners or the brutally hard collars on my custom dress shirt.
I'm 5 foot 10, 250 pounds and XL fits me perfect. I usually wear XXL lululemon shirts or XL from more standard, athletic fit brands. The Athletic fit is a nice square shape that is uniform from the shoulder to the waist, which is what I need.
Can't recommend them enough and will be buying short sleeve versions for casual wear.