This document provides instructions for creating a low-cost Harry Potter costume using items likely already in your closet, such as a graduation robe, white shirt, black pants, and necktie. The costume can be customized into a Gryffindor student by adding a striped scarf, round glasses, Gryffindor crest, wand, and lightning scar drawn on the forehead. Tips are included for transporting and wearing the robe safely.