I'm in the process of muslining Simplicity 2588. I'm making the dress option with the flat sleeves and the fuller skirt for my brother's wedding. The muslin doesn't look half bad, except this annoying problem right under the arms. You can see the pulling above, from the front underarm to the shoulder. I've never had this problem, so I'm not sure what to do. It's not pulling in the back, just the front. The armscye (can I even still call it an armscye because it's a raglan sleeve??) is a size 8 at the top and tapers out to a size 10 right at the point where the folds start near the front of the armpit. I pinned the bodice on and wore it for a while to check the comfort. The armscye is annoyingly high in my armpit, so when I put this on I want to escape and run away! Maybe I should alter the armscye using this tip.
I took out 1/2" at center front to make the fabric fall over the bust better. I'm wondering if this stole ease from the arm area. I really have no idea how to fix this so any advice would be very appreciated.