Tight neckline

Hi,

I’m currently knitting a top down raglan sweater. The pattern’s 1x1 ribbing neckline is too high and tight for my liking. I decreased the rows of ribbing from 12 to 8 and increased the number of stitching from 90 to 120. The neckline is still pretty right. Will it stretch out more the more I knit the body? I had only just started on the yoke. This is my first time knitting a sweater. I’m following the pattern below. 

https://www.ravelry.com/patterns/library/weekend-glow-sweater

Thank you.