Well, I completed the slipper, this time in terracotta yarn, but unfortunately the slipper doesn't quite fit. It is supposed to fit a 9 1/2 inch foot, which is what my foot measures, but the slipper was tight at the big toe. I was going to undo the bind off and knit a few extra rows, but a fellow-knitter suggested that I would need to add to the length because of the way the pattern is worked.
Here is a link to the pattern, so you can see what I am talking about. You can add or subtract stitches when casting on, but I don't know how many more I would need to cast on. My first attempt had 56 cast on.
Unfortunately I had the slipper frogged before I thought to check the tension.