I am trying to make McCalls M5241 – 1 Hour Cardigan. I am having trouble fitting it and having trouble explaining the problem! I have purchased size 12-14 because I am smaller on the top half than the bottom. The armholes are too small, it is tight across the back and I can’t keep the cardigan on. When I pull the cardigan on the armholes won’t stay in position and want to slip down over the top of my arms. I have a slightly rounded back (I think) so I have undone the back seam to see if that helps. It helps with tight back but not keeping it on. I have also made the armholes slight bigger by restitching the sleeve seam at the underarm but that doesn’t help either. Any suggestions as to what might be the problem and how to fix it would be appreciated.