I meant to put up the pattern I developed for these...so it's somewhere other than on an index card on my messy desk..lol
lemme see if I can do this
Using size H hook, crochet in spiral (no joins)
I used Bernat Satin yarn and it's made to fit a size 10 1/2 to 11 female foot. You may want to use a marker for beginning of each round (I personally mark the end of each round-to each his own.)
Magic Ring
Crochet 6 st into magic ring (6)
Round 1 inc every stitch (12)
R2- 1 sc, 1 inc- around (18)
R3- 2 sc, 1 inc- around (24)
R4- 3 sc, 1 inc- around (30)
R5- 4 sc, 1 inc- around (36)
 sc every stitch around for 10 rows (or until fits over toes)
 hdc every stitch around for 10 rows
now find the top of the slipper and use two markers to mark 8 (or 9) stitches apart(this will be the separation for the ankle)
crochet in rows (heel)
finish hdc to first marker ch 1 and turn
sc 26 st, ch 1 turn till end of heel
(I decreased the last 5 rows by 1 sc2tog  in the middle of the heel)
sc 11, sc2tog, sc12(ya, I lost a stitch somewhere in my rows-if you didn't this would end at 25st)(24)
sc around (24)
sc 11, sc2tog, sc11 (23)
sc around(23)
sc 10, sc2tog, sc11 (22)
line up ends and sl st together (I did the right sides together so the seam is on the inside of the slipper)FO
crochet in rows with joins 
reattach yarn at heel sc around opening (I got 51 st) sl st to join

ch 3, dc around, join
ch 1, sc around, join
ch 3, dc into sl st hole, ch 1, dc into 2nd st over, ch 1 around (ummm..so instead of dc in each st, you'd chain at the top of the dc and skip a st, dc into the next st, chain 1 around...I'm not a pattern writer..sorry)join
ch 3, 2 dc around each chain from prev row, join
ch1 sl st around, FO weave ends...

phew...I may never be able to make these again...lol..ttfn