Cotton navy button up with hidden buttons, side venting slits, and pleated back for a slightly billowy, comfortable fit. I bought this on TRR - color has faded slightly due to washing, and there is light wear on the left elbow, as shown. (It's not obvious when on) Shoulders fit is likely 14.5/15 and it was just too narrow for me, as I'm typically size medium. Classic staple for a chic, every day wardrobe.