I am a beginning sewer trying to alter a Kwik Sew multi-size T-shirt pattern. I have a 4″ difference between my bust and high bust w/ narrow width shoulders. I have used a french curve to create a new armscye from the M shoulder to the XL side seam. What I am stumped on, is how to determine the appropriate amount of increased width across the sleeve above the side seam and narrowing the sleeve below the side seam point.
Would I create a new curve going from the XL shoulder pt to the M side seam pt? I am on the right track regarding the armscye?
Thanks for any help you can give.