I'm done again, except for the buttons! Once I had sewn the bodice to the skirt, I could then put on the facings and collar. I made the facings and the underside of the collar in the complimentary geometric. You'll be able to see a small bit of it at the top end of the front placket (at the throat) when I'm wearing it.
Then I had to decide whether to put the belt loops on with the geometric facing out or not. I decided "not". It would end up being too much contrast, I thought. But again, you can get a glimpse of the geometric on the underside of the loop. Here's a photo of the front at the waist with two belt loops and the facings opened up to show the contrast. Now I have to find some nice buttons and get a D-ring for the belt.