Marji tells me that the fold you see in the right shoulder area is what I need to remove from my pattern to bring the sleeve where it needs to be. The folding you see on the left is the blouse trying to correct itself with the excess shoulder fabric.
Helpful highlights courtesy of Marji. I removed the sleeves to see if they were in backwards. Umm, maybe? The sleeve head seemed to fit smoother, but the notches didn’t match up. 
She says that “Back, drag lines indicate you need more fabric – front, folds indicate there is too much fabric”. Which helps explain why it was all tight across the back. Fabric just pulling, pulling, pulling. Oh, and there is only one inch of ease in my bicep. I think it’s clearly time for me to start measuring my patterns. She has some thought that I could have a narrow back. But, I need to do some more measuring to be sure.
So, this weekend I’m going to work on adjusting the muslin (thanks Heather!). I would actually like to wear it. Then, I’m going to start some changes on the pattern so I can use it for the Build a Better Blouse class.
And now, I’m off to bookclub.
