Here's one I found doing a search for 'directions pillowcase_doll'. It is not like the ones I used to make, I don't think, since I believe I formed the head just from the middle, top of the pillowcase, stuffing it and then tying it off. But I can't remember for sure. Anyway, the link follows...

Wanda in South Texas
http://wanderinglily.blogspot.com/

Here is a link that might be useful: pillowcase doll