I don't have it and don't know where to get it but one of the regular pattern makers, Simplicity, McCalls, Butterick, has a pattern for moccasins and I can't see that the socks and the high top moccasins would be that much different. You'd probably just not have the overlapping flap and tie. You might try one of those, they might even have the actual sock pattern.
I left the board for a few minutes and found a free one online
http://www.uen.org/Lessonplan/preview.cgi?LPid=12356
try this one, I'm going to. I found that they don't print out the right size. The first time it was supposed to be the Large and printed out to be about 5 or 6 inches long. I resized the printing area and got closer but still not big enough. Perhaps it's close enough to wing it though, I'm gonna try.