This photo has been adjusted and it's quite small, but there are better versions of this particular shot out there, still the seam is visible. This of course made me happy since it's much easier to make a well fitting back piece with a seam in place.
In this close up it's possible to follow the seam from the neck and down the sleeve, meaning that the fitting of the sleeves need to be really good to make sure that there is no break in the seam.
This last photo give some more information. One is that the sleeves are not connected all the way around the armscye, less fitting there yay!.
When it comes to the lower part of the coat the red lines do not indicate seams, it's rather to show how the front and back piece falls in different directions. The front piece is more or less straight, while the back piece has more of an angle.
Well that's it, now I'm on to more work on the mock up.