Very handsome jacket.  The construction is well-made and the leather heavy duty, it's also lined with thin insulation inside.  I'm about 5'7" 1/2, thin build and about 140 lbs.  So I ended up ordering this in a small size which is a perfect fit for me.  The jacket leaves enough room for me to layer an undershirt and a light to medium long sleeve underneath it and yet still have enough room inside to be comfortable.

You may need to break in the jacket when you first get it, since it feels tight on the upper body.  Granted, leather needs to be broken in.  But after wearing this for several hours, that tight feeling begins to loosen up.

Overall, I am very happy with this purchase!