How to make Sonic’s shoes

The Adidas website has a feature that lets you customize shoes, so I made some Sonic shoes. They’r not exactly the same but it’s about as close as you can get without becoming a cobbler and building them from scratch. The shoes I customized are called zx flux slip on - premium, I would post a link but they keep changing it . As for the buckles, I’m going to use horse saddle buckles for mine, the straps on these shoes do not detach so to get the buckles onto the shoe I’m going to make a cut in the middle par