I've had this percolating in my brain for a while now. I interfaced the black revere/facing with black as that's what you'd normally do, and then I realised that the solid black will probably shadow through where it faces the button area (the collar will cover it further up.
I'm considering recutting the collar and facing it with white to reduce that dark show-through. I'm fairly certain that there's plenty of black fabric, as I bought 1metre of it, I just need to find my white interfacing in the stash - actually it's probably not in my sewing storage but upstairs in the piles of fabric I've pulled out now I'm excited about sewing again.
The return of mojo is possibly due to plenty of blue skies as well as my new job & boss being good, and my workload no longer being overwhelming. Still have insomnia, but I'm now getting a solid 5 hours sleep a night, not the 2, 3 or 4 that I was getting for a few weeks.