Really like this sweater! I think it would be a better layering piece though, if it was a little roomier in the arms and shoulders. I normally wear a small or extra small. I finally bought this sweater in a large and it is still a little tight in the shoulders and arms. Same with the mock neck sweater and tee shirts, which pull a little between the shoulders in front even in the medium. Everywhere else, fine but maybe a little smaller at the neck so it will lay flat.
Really love this turtleneck. I do size up one size:)