I do have to say that it turned out to be an OK fit, considering I'm using a pattern system presumably designed with adult men as it's main customers and using only a single measurement (chest circumference) to scale the entire pattern. Height and waist measurement were all pretty spot on.
If I was making a quick costume rather than trying to create something elegant and beautiful, I would totally use this pattern.
But... it just doesn't have those elegant tailcoat lines. The back is cut in a single piece with none of the lovely shaping that the inspiration tailcoat has.
Results of the next attempt coming soon.