I recently got this shirt at a local farm store and it instantly became my favorite. Today I wore it with skinny jeans to the barn, then a restaurant, then to a friends house, and looked pretty decent everywhere. As they advertise, it's a button down but feels as comfortable as a t-shirt. I bought a medium and it was true to size - flattering but with a loose feel. I will definitely buy more of these.
The Medina Shirt is classified as "Slightly Fitted". I bought this shirt in size small, but would have bought XS if it was available. Since it is knit, you can buy it smaller if you want it to be more fitted. It is a very comfortable shirt.
Really between ever so slightly fitted and relaxed. If you wear Carhartt, order the size you would normally with t-shirts. It is a true size shirt, fits like a misses, and NOT like a junior size shirt. It is a soft knit. You will love it.