Phentex Slipper and Craft Yarn
is still available to purchase through the Bernat Yarn website. Every skein of Phentex yarn has a slipper pattern on the label. When I recently bought 15 skeins, I got about 9 different patterns!
There is also a great pattern book by Phentex, called "Fun Family Slippers
I just recently made some men's loafers, using a pattern from that book.
Loafers for Ken
, on Flickr