I really hate leaving you all hanging though, and I'm heavily dosed up with cold medicine right now, so LET"S DO THIS!
There are a few different ways you can finish your inside facings. You can serge the edges and tack them by hand onto the seam allowance, pink them and leave them loose, douse them in vodka and set them on fire, but my favorite is to tape them down. Not the scotch tape way, of course, but the fusible kind like this Dritz Stitch Witchery.
You can use it to fuse two layers of fabric together, or to finish raw edges with seam tape.
Here I have laid down a strip of the (shinny) fusible tape. Next I just stick the (very pretty) vintage rayon seam tape over top and a quick press with the iron makes it permanent.
