SPOILER ALERT: This article contains spoilers for “Joker: Folie à Deux” now playing in theaters. As costume designer Arianne Phillips was conceiving ideas for “Joker: Folie à Deux,” one character she got to spend considerable time on was Lady Gaga’s Lee Quinzel. In the film, Gaga plays Lee, an inmate in Gotham City’s Arkham State Hospital. Arthur Fleck (Joaquin […]