We could probably give you better fit advice if you gave us your height and weight and maybe an approx. bust size.
Also, do you want the Shak and/or the Carrie to wear UNDER overcoats or do you plan to wear them OVER regular tops, like jackets or cardigans, on the outside? In other words, do you want them to fit like a jacket with room to spare, or like a form fitting turtleneck sweater?