Also a BIG problem you'd have is that everyone here has cut their armour to fit them, so unless you happen to be pretty much identical in stature the armour wouldn't fit you anyway.
You might be able to find a costume shop that rents out costumes, but even if they did have a full suit to hire out, it'd be a rubies one.
Err. you COULD make a suit out of cardboard and paper mache if you're skilled enough with a pair of scissors.