How flattering the original style is could partly depend on what the designer has done for bust shaping. The picture of the yellow version on the Butterick illustration does show the tell tale pulling from the apex. If the coat has been cut from a block with no darting and relies on being big and baggy enough to cover all the bases, it's not looking good for flattering the usual range of women shapes. OTH if the darts were included in that seam which has a pocket inset in it it should hang pretty well. The first self drafted coat I made used the dart in seam with pocket style, and worked well, not boxy.