Using a K, hook, ch 21, sc in each sc across.
do 24 rows of sc fasten off.
ch 21, working in back loop only sc in each stitch across.
do 24 rows.
Fold foot square in half lengthwise leaving the starting chain for the toe, Slip stitch the other side together for the heel.
Skipping the first eleven rows (from the toe back) attach yarn in the next stitch. Slip stitch the two pieces together along one side, around heel to the other side. Leaving the last 11 rows unworked.
Starting at toe pull up a loop in each stitch of starting chain, YO, draw through all loops on hook, YO, sc. Turn slipper to wrong side and slip stitch top of foot fasten off.
Attach red and continue to slip stitch cuff all the way to the top. If you like you can add a chain between the red and white sections, or a pom pon to the front.