In the mid 1960's, when the simple shift dress became popular, designers began experimenting with seams to add some visual interest to what could be a pretty basic style. This 1960's coat is by a company named Irvama-Carmel. I don't know who the designer was, but I love the ingenious use of the S curve in the front Princess seams.
The seam starts at the neckline under the collar, and curves out over the bust, back in above the waist, and then out to the side seam. That seam incorporates the bust shaping and also provides placement for the faux pocket flaps. Why use a straight dart when you can do something so much more pleasing to the eye?