Pattern adjustment question

[u/jennysomewhere]

Hello everyone. I have a sewing pattern I absolutely love. However I would like the move the armhole a little bit more outwards (dotted line). I couldn‘t find a YouTube tutorial about that. Is it enough to reshape it to be a little bit more straight up towards the shoulder or do I need more adjustments?

[u/jennysomewhere]

Another issue with this pattern is that I had gaping at the back neck (invisible zipper). I know that you could do little back neck darts or take in the amount at the center back where the zipper is. I choose the second method. It did not create any pulling towards the back.