French Seams

Hiya everyone,
Just an update on my yellow swing dress (butterick retro b5209). Done the bodice which was the hardest bit ith the lining to do as well.

Using a silk crepe de chine, which is beautiful, and slinky. A bit too slinky in fact, was a bleedin nightmare to cut out, doesn't seem that keen on doing what the iron tells it to do, and frays like a mother.
Anyway, as a result I've decided to do French seams on the skirt; the top is lined so that's nice and tidy.

One question though, how would I do a French seam at the side where I also have to add a zip in 3/4 of the way up?? I don't want any raw edges showing at all.
Any suggestions, or if you know of any handy tutorials I'd be grateful??
Cheers guys