After reading the reviews I bought this in my normal size (3X) and it fit exactly as expected.  The fit was a little off in the shoulders on me but I have very wide shoulders so that's not unexpected.  As mentioned it's unlined (which I wanted as I get hot easily) and the fabric is a bit stretchy and not super thick (which I also wanted).  The top of the sleeve was a bit snug but not uncomfortable.  The "scrunching" on the sleeves wasn't the highest quality or maybe it was because the sleeves were snug for a 3X.  Since it is unlined the lapels can look a little "sloppy" as you move around but overall I'm pretty happy with this purchase especially at the price.