I think you get what you pay for. Or, it's just silk. Anyway, it moved and grooved all over and in the end, I used a Pro-Sheer elegance fusible interfacing on the yoke pieces to stabilize it.
Second. Biggest design change is moving the zipper from the side to the back. So, I constructed the back, and have inserted the invisible zipper. [Basically, the pattern instructions call for constructing the back and front bodice, then sewing the shoulder seams. I just went ahead and attached the skirt as well.
All pieces cut out and sorted.
Third. The pattern calls for the yoke and bodice sewn together in an interesting, flat, from the right side fashion. Kind of top stitched on, if you will. I did it more conventionally, right sides together, staystitching each piece, and clipping curves where necessary.
Fourth. I'm lining the whole thing. With silk apparently, but I'll have to confirm that. For the yoke, I'm simply underlining, basting the silk to silk, and treating it as one piece. I'll use a French seam for the shoulders. I'll explain how I'm doing the rest of the lining in another post.
Fifth. (I didn't really mean for this to get so long) The midriff piece in the original design is the contrast fabric, but I've decided to use the wool, and made piping from the yoke silk to outline. OK, I think that's it. Have a look: