Get an expensive look in your bathroom for very little money. One way to cheat on the look of a large mirror is to use smaller glass tiles or sections, which, due to much easier production and shipping, will usually come at a fraction of the price.
Most armor costumes you see (ex: Iron Man, Mass Effect, etc) are made of EVA Foam, cut and glued together, dremmeled for weathering, and painted. It's flexible, strong, formable, and cheap. EVA is commonly used in interlocking foam floor tiles from hardware stores, automotive centers, and even discount stores like Big Lots or used in yoga mats. It doesn't matter what color, you're going to paint it anyway! Mad props to BioWeapons for creating the happiest set of armored boobs I've ever seen!