What a pleasant pattern. I knitted the smallest size and it is roomy at the sides while sleeves are tight. I am 5’4” and 125 pounds. Prior to knitting neckline, if you try your jumper on, the shoulder and sleeve attachment feels awkward as it sits past shoulder by quite a bit. Don’t fret, this will slide down after you have your neck binding and you don’t feel the urge to pull the sleeve at your shoulder up to make it “look” right.
Have faith, the pattern is really good and it is a comfy sweater to be wearing!