Looks like you are going to need a pair of scissors, cardboard, craft material, and a whole lot of duct tape!
You run down stairs to gather the supplies, all of which are easy enough to find. You scamper back up to your room and get to work!
First thing is first, you need a plan! You grab some paper and colored pencils; without a sketch to work from, your costume will surely not turn out the way you desire. It has to be fresh, bold, risky, something that will make jaws drop all around. You have more cardboard than you can eat, enough crafting material to decorate an elephant, and an imagination that keeps growing bigger and more fantastical by the second!
Tell me, What Are You Going To Make!?