There are a lot of reviews discussing the sizing of this shirt jacket. That was by far my biggest contention with ordering it. To make a long story short - I am 5' 10" and weight 170 pounds and the medium is close to perfect. It might be a slight bit big around if I am wearing a t-shirt, but I am pretty sure if I went down a size then it would be too small, especially if I was wearing a sweatshirt or a sweater. I am very happy with the size.

It is a very good looking casual lightweight jacket. I really love it. I chose this shirt jacket over other brand's shirt jackets, because this one looks more like a jacket than a shirt, where-as the other brands look more like an oversized shirt which I did not like.

I only have one issue with the jacket and that is the size of the inside pocket. It is a little small and will not fully hold a large sized cell phone. If it were a little deeper, then it would be ideal.