I had dingy white tennis shoes that fit well. I wanted some easy, comfy slip-on shoes to wear around the house. This is how I changed the white lace up shoes to dark gray slip on shoes. You will need some basic embroidery and crochet skills for this project. The usual equipment like scissors, large and small, crochet hook, embroidery needles, fabric glues and marking pencils will also be needed. I used cotton fabric and cotton embroidery thread.
The first thing I did was wash the shoes. I put them in the wash machine with a load of rags. The insole was loose in one, which was part of the reason I wanted to work on the shoes.
Then I took them apart. I pulled the remaining insole out and set them aside. Then I used tiny embroidery scissors to cut the stitches and remove the thread. I also removed the bias trim around the heel of the shoe. Save all parts as you remove them. They may come in handy later.