I have a character that has a rig pose with the arms in the A position. The character however will be arms down most of the time. The director said there will be some instances where the character may need to lift the arms and so the fabric draping needs to look right from both positions. I used a MCX cache from maya so I can raise and lower the arms and I see that when the sleeves raise with the arms, the armpit area of the coat stretches with it and is curved. The coat is also buttoned all the way down, it's a long coat like a trenchcoat sort of, but more formfitting like a suit.
I know that this kind of stretch is natural in suits, but for me it appears to be a curved kind of stretch. I have strengthened the garment and tried changing physics presets but I keep getting the same results. I've spent almost a month trying to adjust the sleeve patterns and the arm hole opening. The director keeps pointing it out. I can't upload the screen shot but I can show you an illustration of what is happening. The left image is arms down, the middle is what is happening currently, and the far right is what I'd like it to be. I need that profile break, that almost angular shape so that the torso to the waist doesn't start bending, but maintaining as straight a line as possible.