first you are gonna need a few things
first you will put on old socks.
next you will wrap the sock in duct tape while they are on you bu not to tight because then you wont be able to get them off.
now you have the entire sock wraped so you can take it off
now you can create a strap for the back you can use velcro to strap the shoe
this is what it should look like
hope you like it and dont forget to comment and give ideas.