Size 13 straight needles (or size needed to get gauge)
Super Bulky Yarn
Tapestry needle

Gauge of 3 sts X 3 rows per inch.

SOLE:

Cast on 12 sts.
Rows 1-17: K straight in stockinette
Row 18: K2tog, k across to last 2, k2tog (10)
Row 19: K stockinette
Row 20: K2tog, k across to last 2, K2tog (8)
Bind off
Repeat for other sole

TOPS:

Cast on 8 sts
Row 1: K stockinette
Row 2: cast on 1, k to end of row, cast on 1 (10)
Row 3: Knit stockinette
Row 4: cast on 1, k to end of row, cast on 1 (12)
Rows 5-9: Knit stockinette
Row 10: K5, Bind off 2, K5
Row 11-23: K 13 rows stockinette on the 5 before the bind off
Bind off those stitches
On the 5 sts after the bind off, K 13 rows stockinette.
Bind off.
You'll have a shape that looks like this:

JOINING:

Fold the top of the slipper in half, the side you want against your foot on the outside. The two long strips at the top should be in contact with each other.  It should look like this:











Sew ONLY THE TOPS of the strips at the end together. Use a really  long thread, for ease of attaching the sole later. This is the seam in the heel. It should look like this on the wrong side:










And like this on the right side:










Pick up the sole and hold it against the completed top. the sides you want against your feet should be on the inside. Sew the top of the slipper to the sole, being careful not to sew the hole that your foot is supposed to go through.




When you're finished sewing it up, it should look like this on the inside:




and this when you flip it right side out:













It does look a bit fat and short at the moment, but it will take on a more conventional foot shape after being worn for a while, like so:


Repeat to complete the other side of the pair.