Find or purchase thick, warm fleece or other material for the upper portion of the slipper and suede, leather or other nonslip material for the soles of the slippers. Trace the desired foot size by using an old pair of shoes or slippers. Lay the right and left shoe or slipper on the sueded material and trace around it to form the two soles of the slippers. Cut the soles out, leaving 1/2 to 1 inch of extra material around the entire shape to provide room for sewing.
Draw out the upper portions of the slippers on to the fleece fabric, in a U-shaped piece to fit around the toes and cover the upper part of the feet. Leave another U- or O-shaped opening at the ankle area for the foot to slide into the slipper. Cut out the upper piece of one slipper and use it as a pattern to trace the second piece to ensure they are the same size.
Sew the two portions of the right slipper together using your sewing machine. Repeat with the left slipper. To ensure that they are securely attached, sew a second seam on each slipper. Finish by attaching a ribbon or embellishments onto the slippers, if desired.