I tried it again as a long shirt, and I'm very happy with it. This time, I used a floaty cotton, (not as drapey as the rayon) and the ease looks better, more structured, less sacklike. It is super comfortable in hot weather. The neckline is very high but opens nicely. I added sleeve tabs to hold up the rolled up 3/4 sleeves.
Size: 12 in the shoulders/bust with 3" total FBA, graded out to 14 in the hips. Inner collar stand and placket are a thin interfaced chambray.
FBA on a roll of medical paper:
Dart and inner collar stand:
Dart and sleeve tab: