If you're looking for the original pattern, it can now be found on Ravelry!
I've sent this to a few people on Ravelry, so I thought it might deserve some follow up attention because I think it might be confusing people, and I've slightly altered how I do them to make them more secure on the sides.
Most people do simple slippers as rectangles. Fold and Sew. I've found I don't like that style, as it leaves a weird elf-like quality to the slippers. So I do mine differently - a circle and a rectangle put together, like this:
The problem is that I think people are viewing it is a flat circle, when its not. Its in the round, like a cup. So you are always joining, they doing the chains.
The circle is at the front of the slipper, and the rectangle is at the bottom, like this:
If you can imagine it, you look at the circle in front of you and the rectangle flows behind.
Hopefully it makes sense that the circle looks like a cup when done correctly. A flat circle will have to be folded to make the shape.
So the instruction which I need to update is that at the end, I now take my sewing needle and sew a couple of the hdcs up each side of the circle giving it more definition.
Look for next month I'll do some step by step photos - this really is easy!