To make these slippers you will need about 4 oz of wool. Using size 13 needles, cast on 28 stitches. You can use slightly bigger or smaller needles and adjust the number of stitches. It doesn't have to be exact. Knit in stockinette for 50 rows or until piece measures 12" - 14" long. DON'T cast off. Cut your yarn leaving a long tail. Using a yarn needle thread the stitches onto the tail. Gather tightly to form the toe, knot but don't cut the tail then sew about 4" closed which makes the top of the foot. Leave about 7" open for your foot. Then fold in half and sew the other end from top to bottom which will be the back of the heel. They will look huge! Make sure there are no holes in the toe area because they may not felt closed. Repeat for the second slipper.
To felt, put the slippers in a lingerie bag. Fill the washer to the lowest level with hot water, put in the slippers and a small squirt of dish liquid. Also throw in 2 pairs of jeans to help the felting process. Let the machine agitate. Keep checking every 5 mins or so to see if your slippers are your size. You can put your foot in a plastic bag and try them on. Keep agitating until they are the right size. When they are your size, put them through a rinse and spin cycle and then put on your feet to shape. Carefully remove them to preserve the shape and let them dry.