If you live in a sunny area where it doesn’t rain much, then you can consider using cardboard for your costumes. It’s sturdy, somewhat flexible, and inexpensive — especially if you’ve moved anytime recently. EVA foam or craft foam is a more durable option, but if you’re okay with something more temporary, why not cardboard? Showa-Note even sells sets in red and black if you don’t want to invest any time into the project. Their samurai suits are about $28. That’s not a bad price to pay even if you only want to use the suit as a template for a longer-lasting set of armor. The armor comes in sizes for adults and children, and you can learn more about it at Showa-Note’s website.