My first idea was to make a medieval coat  but after  I considered a few little things, I realised it can be both. I did the hood smaller than what we see in the movie and so it could be usse as a medieval coat,  I did not put the gryffindor house patch. The coat is longer than what we see in the movie: mine is floor lenght. Pattern        I used McCall’s 4340 which is a good pattern. Fabric        Because the hood and the sleeves are smaller than on the pattern, it only took 2.8-3 m of fabric in each color. The black fabric is bengaline and the maroon is wool crepe. I was very lucky because I bought the maroon fabric before my tie and the color matches perfectly. Advice        Personaly, I find a two color robe is much nicer but it makes the robe a little heavy.