Best and easiest binding technique out there! Creating this pocket at the beginning means you don't have to be so precise in the length of the binding at the end. Tuck the end in the pocket, sew it down, and once it's folded over and hand sewn to the back, you can hardly tell where it joins!
I'm going to do kind of french seams to my coat. Kind of - but after this part seen on the picture, I will edge stitch that little flap down. So on the right side it's going to look like veeery wide double stitch. Very chic!