I‘m not a tailor, but I think I would try like this:
View attachment 289813
1. I like the jacket and it seems to me that the construction is well done (stitching, etc.).
2. Agreed that the back is off and the explanation seems plausible with the attached pictures of the original jacket back.
3. If that picture of the original is what was used for @red devil inspiration, then it seems clear that the curvature in the original back would need to have been highlighted as necessary. Otherwise, if not specified, then the pattern maker will generate lines that make sure the pattern joins up. (regardless of whether they are the best lines the jacket might have).
4. I agree it would be great if they had a design specialist as mentioned. However, it seems to me they are targeting a price point and bringing in another person(s) as a specialist will drive up overhead costs however much.
Given that this part of 5* seems like a (rapidly evolving) start-up, and the ability of 5* to turn out great jackets is increasing by leaps and bounds, I feel like they are doing a great job. If I wanted full design help and higher attention to detail, I would know that I need to move on to a company that provides that and pay whatever that would cost. In the mean time, I will continue to cheer 5* on to continued improvements and hope that they can maintain a very good pricing structure.
Just my $0.02.