Yes, finally!
Whooheee!! It took a lot of tweaking but it was worth e-ve-ry minute! As you can see I decided on plan b: a band to finish the neckline. First I tried plan a: deepening the pleats, and that seemed to work. But after I stitched the neckline to secure the pleats in place, it had become widen again. Whaat?! So plan b it was. I pinned the pleats in the patternpaper so that I could use that as a guideline to draft the patternpieces for the band, which is 3 cm wide. And that did the trick. This fits and looks so much better on me. Now it's not gonna drop of my shoulder or show any bra-straps. Nor do the pleats end in an awkward and rather abrupt way next to my skin. Yes, I am very pleased with the outcome. I sewed the pleats in the back as darts. That eliminated just enough of the excess fabric to create a smooth line. There is no bulkiness above the waistband any more. When I basted the hem, I saw that the back was high...