Isaac Mizrahi for Target jacket

Cotton lining and jacket is polyester and cotton. Can we worn open or there is a hook and on the inside lapel to keep partially closed. Sleeves are noted at wrist for extra room. Curved seaming on front to give streamlined look. Stand up collar. The color and feel is like a khaki feel and depending on the color you put it with it has more of a darker khaki to olive green tone to it.