I made myself a greatcoat some years back. I'll have to take some pictures.

I ended up just drafting the pattern myself. The pattern I bought must have been designed by the insane because the pieces didn't fit together and the sizing was all out the window.

I took the basic lines of Kannick's Workman's Jacket to get the double breasted front correct, and then just drafted the rest of it. I added in the tail pockets and constructed the cuffs based on what I learned from doing a civilian frock coat.