I though this one would be ok, but no. Even a straight strip of cloth was an absolute pain. Took three tries and two unpickings to get it to lay reasonably flat.
This process took three whole evenings.
First attempt.. I even tacked it down carefully, not relying on just pins.
(Yes, I used my ironing ham to help hold the shape I wanted around the neckline. Didn’t help.)
I found the easiest way was to iron the collar strip first. Put in the two folds to hide the raw edges, and measure out the middle fold so the right side was the same width all along. This also helped stiffen the fabric and hold it straight and prevent weird wrinkles when I machined it into place.
The entire length of collar fabric was already stiffened with iron-on interfacing. But ironing in the folds really helped with stabalising the entire thing.
Yes there were two ‘weird’ spots. I unpicked the seam and re-did it on the machine. Problem solved!
Next time this whole process should be much easier.
This was also the point I decided to turn this project into the jacket, and intend to re-make this whole garment as a top in a different fabric to match the skirt I’m planning. I must be either mad, or a masochist.