As predicted, I did some wrong math on the pattern drafting effort. The armholes ended up very tight. The book says to up the armsyce by .75 inches, so I did my usual .5, which in retrospect wasn't necessary (might actually need to lower it instead). Also, the pattern calls for a straight silhouette, but I cut mine on the curvy side. So the resulting drape looks a bit funny.
Construction-wise, it's a mixed result. I didn't have any idea how to attach the roll collar, so it was pure improvisation, full of turning inside out and stretching here and there. At one point I actually heard "rrrip!" Thankfully I saw no sign of broken stitches, just a very stretched collar.
I used French seams for the sides. It's my first time using French seam and I love the finished look, so I think I'll be using it a lot from now on.
Full length (the stripe effect is from the window blinds):
I lightened up the picture a bit so the draping would show better:
I think I will make this dress again in the future, with a straighter silhouette, corrected armsyce, better construction know-how for the roll collar, and of course, nicer fabric, because apparently polyester melts when pressed.