So I made the pattern, now let's make the real thing.
I drew the pattern at the upper of two layers of fabric and marked each outline to its symmetrical piece - each line was drawn really thick, I put them wrong sides in and thuded with a fist. Method for the lazy :)
I remembered that once I was making a prototype from lightweight fabric and then the real sturdy corset with three layers was too narrow, so I sewed 2 mm from the drawn line.
I also had to put a bit more to the front center. I found out that the seam allowances must go to the center. The bones would lay one on another at the lowest point of the front panel if I didn't widen the pattern. A tunnel for each bone.
I sewed and serged the seams where I was sure I won't be adding in case the corset is narrow. I fitted it and found out it was just okay. So in the end I added 2 mm to each seam plus half a cm to the center front.
Maybe once I'll want the buy these special endings for boning, but at the moment, I don't see the point.
I cut the upper edge. I inserted the boning until I reached the stitches and drew a line at the upper edge. Then I took out each bone and made a line 8 mm lower than the first one. There I will cut and grind again
I punched the holes for lacing. They are just behind the boning, so that the fabric would not tend to wrinkle. I inserted grommets.
The upper and lower edge is neatly finished with a bias tape.