Instead of sewing bias tape around the arm holes, I just attached the lining to the shirt at the arm holes and turned it right side out and pressed it. So the side seams are sewn on each piece separately and the lining is only connected to the shirt at the arm holes and the neck.
My only issue with the instructions was it didn't say how far to put the neck of the body up and inside the collar piece. So I put it all the way in and tried it on her and that was squeezing her arms like sausage links - so I unpicked it and then lined it up along the open edge instead.
Other than that, the pattern and instructions were very easy to follow. This shirt went together really fast. And I love how it turned out. I'm already digging through my fabric stash to see what else to use and make more of these. You can even add to the length and make it a dress - so that will probably be my next one.
Oh, and thanks Mom for the green snaps! I'm borrowing her snap setter and snap stash - which technically means I'm using a few of them since she has some awesome colors.