I have a RTW (ready-to-wear, aka store-bought) dress which fits me well, and I'd like to sew a copy of it. I've done this before with loosely fitted tops, like t-shirts which only have minimal shaping, by doing a "rubbing" - lying the garment flat, tracing the seams on to tissue paper, and using that as a pattern base.
The bodice of this dress has darts on the side, so obviously lying it flat to trace will not work. I'm also concerned that the difference in stiffness between tissue paper and the dress fabric (a drapey knit) will cause inaccuracies if I try to e.g. make creases in the paper until it "looks right". I don't want to pick the seams of the dress and take it apart.
Is there a good technique to trace the piece with the dart? Or, how can I reverse-engineer how much of an angle was used for the dart? I do have a dress form, so answers which involve that are welcome!