I drafted the bodice to a size 38 and the skirt to a size 40, despite having lost a bit of weight, knowing that the effect I was after was quite a loose fit. I used a remnant of my lovely rayon spot fabric as my trial top.
I had to take the side seams in under the arms and increase the bust dart but that was the only alteration I made. Oh, I think the dress may have had an invisible zipper under the arms but I left this off as well. Can you tell how little notice I took of the instructions?
I used a self made bias binding for the neck, back opening, button loop and armholes.