I have a subcription -- very cheap, if I remember right -- to Threads Insider. Following is the link to Shoulder Slope lessons. VERY helpful. I had to watch it 5 or 6 times before I could follow what she was telling me. Then, I finally just tried it, and it made sense. I think it did a great job of pulling all the folds out of the back of my blouse from my shoulder to under my arms. If you sew, this is MOST IMPORTANT THING #1 you need to know how to do -- in MY opinion.
Gotta run. Will try to find time tomorrow.