Just when I was ready to blame Vogue..... I realized that this pattern is a little different than most. The back bodice actually extends onto the front, so the shoulder line is aprox, 1 1/2" from the sewn seam. My marks had worn off on the body, so I defaulted to the normal placement (top cap of sleeve at the shoulder seam).
The edge of the ruler would be the sewn seam, and the red dash is the shoulder placement on the wearer.
That's when I ended up with this..... horror!!
When it should really look like this....(I know black and shiny, really difficult to see that this is infinitely better).
The true test of gaping is wearing it and lifting your arms, and seeing if it rides up and opens down the center front.
I wore it for a little while and even after the changes I made there is still slight gaping on me, also, I wear my sleeves rolled up, and it was tight around the arm. The sleeve placket would have to be deepened. It's really a shame because the shape of the princess line is nice, and there isn't a lot of excess ease in the sleeve cap. I think that breaking the code on the non gaping wrap top (excluding knits), is that the armhole would need to be higher, or it would have to be a flutter sleeve. I think with either I would not have gaping. There were a lot of good points, but at least for me, there will need to be more work done, in the meantime, I have a new pajama top.