I'm using Kwik Sew 3484, which seems to get universal praise for ease and style. Since I have not yet tackled collared shirts and I don't have a lot of experience with buttons, I decided to buy some inexpensive cotton that was on sale for my first attempt at this shirt. If I botch it horribly, it was no more expensive than muslin and if it comes out wonderful, well, Phineas can go ahead and wear it.
I had cut out and marked the fabric weeks ago, so this weekend I was ready to set right to work. As you can see, the shirt is in a half done state - collar, front and shoulders done, but no side seams, hems or buttons. I had a moment of duh with the collar, which looks ok anyway. But I definitly feel like next time it will go much more smoothly. Since Phineas didn't want a pocket, I decided to add trim to make it a little more interesting.