Robes em filmes de Harry Potter

O comentário de Jason Baker está correto.

Cuarón also made the characters feel a bit more contemporary via their wardrobe. In the previous films, the students had worn school uniforms and robes the majority of the time; in Azkaban, there was a shift. The young characters were now seen in normal, everyday clothes as a further reflection of their personalities and maturation. Too, they could individualize their uniforms a bit

_{Harry Potter: From Page to Screen: The Complete Filmmaking Journey by Bob McCabe - Page 104 - Prisoner of Azkaban analysis}

Eles pararam principalmente de usar roupas nos filmes porque eu acho que eles tentaram investigar em seu tempo livre (ou seja, nos fins de semana, porque senão eles teriam suas aulas normais) - então essencialmente eles não pararam de usar vestes, eu era só que eles não precisavam.