Thanks, Slew. I always enjoy seeing your stuff. Steed does good work for you.
I've been eyeballing flapped breast pockets lately, so I was quite interested in your specimen. I wonder if the uppermost corner of your pocket is in the same spot it would be on a typical straight pocket, so that the flap is angled downward from there.
Did you discuss which way the pocket should slope? Your direction seems to have been most common back in the day. Terry-Thomas often sported flaps like yours, for example. But Patrick Macnee's followed the slope of the shoulder line.