Casting Your Foot: the mold
PDF Sewing Pattern Everyday Loafer Soft Soled Outdoor by shoeology
DIY Idea -- Learn how to make custom wedding shoe stickers using the Cricut Explore!
Make This - DIY Shoes - Part 1 - Intro & Supply List - Luxe DIY - You can reduce the pattern to make an 18 inch doll shoe!
Sew-It-Yourself Shoe Organizer Tutorial - cutting directions are given for children but adjusted ones for adults are mentioned in the comments.