Slipper socks make a great gift, especially for children and older people who may be more at risk of falling on a slick surface. They are also a great way to keep your feet warm during the winter. Fortunately, there are a couple of different ways to make slipper socks, some of which are easy enough for anyone to do and others that may require some sewing or knitting.
From existing socks
Find a pair of socks appropriate for slippers, such as thick knitted yarn socks, fleece socks, sweatshirt fabric socks or any other warm thick socks.
Lay out the socks so the soles of the socks are flat. Trace around the flat soles onto a piece of paper, then cut out the paper to use as a pattern.
Cut two soles from the non-slip gripper fabric or thin rubber, using the paper pattern.
Use a sturdy fabric glue to glue the non-slip soles to the bottom of the socks. You may want to test the bond before and after washing, and before giving them as a gift.
Trace a sole pattern onto a piece of paper, using a shoe of the right size or someone's foot. Trace a sock shape with a flat bottom onto another piece of paper (like when you draw shoes for stick figures), making the bottom the same length as the sole pattern.
From your fabric (i.e., fleece, sweatshirt fabric, thick low-stretch knits), cut two soles and four of the sock shapes, following the paper patterns you made.
Cut two soles from the non-slip gripper fabric or thin rubber, using the same paper sole pattern.
Sew the fabric soles and the non-slip soles together to create a 1.2 cm (1/2 inch) seam, with the wrong sides together.
Sew the top of the foot part of the sock shapes together with the wrong sides together, creating a 6 mm (1/4 inch) seam that will be on the outside of the sock when finished.
Open the top part of the sock and centre it over the toe of the fabric sole of the sock. Sew the top part of the sock together with the sole of the sock, using a 6 mm (1/4 inch) seam. Remember, all of these seams will be on the outside.
Sew the back of the top part of the sock together, starting at the heel and using a 6 mm (1/4 inch) seam. If desired or needed, hem the opening of the sock.
If you want to make slipper socks from existing socks, you could also use puffy fabric paint to paint designs on the soles of the socks instead following the steps above.