Looking at Langlitz Japan's pictures helps a lot to figure out what might be possible to do.
I ordered two:
1. light black cow Columbia with hidden collar and lapel snaps and detachable fur collar
2. Royal blue cow Cascade, cossack collar, shoulder pads fitted to yoke, elbow pads and pinstripes.
I checked out Langlitz Japan also before ordering mine. I spent a good 2 weeks looking.