I think it's not so much about redesigning the costumes as presenting the familiar in an unfamiliar context to the modern mind, and the unfamiliar in a familiar context to the (imagined) baroque mind. The titles of the pieces are a clue: "Portrait d’un bouffon au sourire grimaçant (Portrait of a clown with a grim smile)" … "Portrait d’un homme en vert vraiment très musclé (Portrait of a muscle man in green)"