The initial fit on left, today's fit on right.
The back darts need to be closer to the center, especially below the waist, so they point to the fullest area. The left dart is further from the center and creates more drag lines. (I really slapped this mockup together and it shows).
I like how the armhole hits at the shoulder line on right and am planning to gently scoop out the back neckline.
I'm pretty happy with the fit above the waist, at least in this stiff fabric. There's enough room to move but it doesn't look baggy.
I don't know what to make of the diagonal drag line below the waist. Maybe it's a symptom of the other problems.
The front still has some problems as well, but nothing major. Resewing the side seams from upper hip to armhole, with the fabric evenly distributed, should get rid of the drag lines from dart to side seams. I think.
The hip adjustment has been pinned but not sewn.
Now to: adjust the back darts and side seams and check the fit. Also rotate one bust dart so it's horizontal, leaving the other side as a control.
I'll try the jumper on with a blouse to see how the armhole fits. My initial idea was for the dress to be wearable on its own or with a top, then realized that sleeveless velveteen rarely makes sense ;)