I have had a bit of a frock coat oddessy in my life, I've commissioned millions of them from all manner of professional tailors, and the one thing hardly any of them seem to be able to achieve is the hourglass "waisted" shape of a frock coat, probably evidenced best by some of Tom Baker's, circa City of Death. A frock coat is something that, apparantly, even the best in the business have trouble with. Yours is a magnificent achievement! You're already ahead of many of the online "bespoke" "tailors" out there!