I finished this up today--my first Fitted Knits FO! The button and buttonhole need to be adjusted, but I've got another three months before cold weather hits to worry about that.
Details: I used Cascade Magnum, the recommended yarn, in camel, on size 19 circulars. I shortened the arms a bit by not doing as many stockinette rows before the yarn overs and not doing any stockinette after the yarn over repeats. I also made a size up from what I normally would make, since I think I'll be layering this over pieces quite a bit.
Bulky yarn ... instant gratification.