I've come to the conclusion that there's really no way to finish this invisibly. Except for adding a second layer of organza to enclose the seams, and that would make the color difference between that and my skin way too obvious, and therefore defeat the purpose of using that nude organza in the first place. But here's what I've tried:
Option 1: A hairline seam finish (a very narrow hem-type thing, turned under twice to enclose the raw edges. The first two lines of stitching were done by machine, but I sewed the third by hand.
Pro: This was the easiest/least fiddly option, as I didn't have to deal with narrow strips of anything and the stitching did most of the work for me. And if I do the stitching with a thread other than white, this could be fairly invisible.
Cons: There's still that darker finishing edge where the organza is tripled up. And matching the thread could be problematic.
Option 2: A bias (more or less) binding, overlaid with the lace. Again, interior finishing was done by hand.
Pros: This looked like the cleanest finish at the end around the curved area, and was also the easiest to hand-sew the inside.
Cons: The edge is really peachy looking, because it has the most layers of the organza. It was also kind of stiff, and the binding was pretty tough to work with at that width.
Option 3: Just a strip of the lace.
Pros: The whiter parts where the sunflowers were looked pretty good.
Cons: The netting parts look kind of sloppy, and I'm concerned about the organza edge fraying within that. Also, again, the strips were fiddly and hard to work with. It's also going to be virtually impossible to avoid some kind of thread line, because that row of machine stitching was pretty much necessary to give me something more stable to anchor the netting parts of the lace to.
So what do you think?
Aside from that, I did get to do a bit of actual construction work today. I spent some time constructing the top and bottom of the front sleeve bits, and sewed those on this morning. I did end up using a French seam for this part, so hopefully the color difference won't be terribly obvious when I'm wearing it instead of Donna. I'm a bit more pale than her! (I guess most people won't be looking down at my shoulders anyway, right?) I'm also hoping that it fit ok, because dummy me, I didn't realize until AFTER I trimmed the seam down that I should have sewn it a little away from the stitching line rather than right on it! But I don't think it was so skintight of a fit that it'll be a huge issue, losing that little bit in the shoulders. And anyway, I haven't secured the straps in the front yet, and probably won't until I have the zipper in and know the fit once and for all, so I can always compensate by adding a little length there if needed.
I'm going to hold off on those edges for now-- on to the waistband!
(Edit: Rats, how did my blog suddenly get all ugly?! Not that I have time to mess with it now...)