So you would like to dress your pet like a Samurai? As it turns out, someone has already thought of the idea and made such a product. This Samurai Pet Armor accommodates cats and dogs. It is lightweight and doesn’t make your pet uncomfortable.
The armor is available in 4 colors and 3 sizes. It is made from polystyrene, polyurethane, metal fastenings, fusahimo cord, and metal snaps. Costs $269 at this time. Of course, you could always learn how to 3D print one.