This is a simple idea. You can offer kits or make the socks yourself for sale.
Make a secure stitching of a safety pin of magnetic snaps, on the inside of a sock and in an area that won't disturb the user.
Make sure the needle part and hook are exposed, and the rest should be secured and hidden inside the sock.
You can sell a kit where the user gets a patch to just secure and then use the already secured safety its usual manner.
Basically, you have options in creating a system where customers can avoid having to by a new pair of socks because they lost one in the wash.
Make a secure stitching of a safety pin of magnetic snaps, on the inside of a sock and in an area that won't disturb the user.
Make sure the needle part and hook are exposed, and the rest should be secured and hidden inside the sock.
You can sell a kit where the user gets a patch to just secure and then use the already secured safety its usual manner.
Basically, you have options in creating a system where customers can avoid having to by a new pair of socks because they lost one in the wash.