The Scarlet Witch is no longer the only witch established within the Marvel Cinematic Universe as WandaVision (2021) twisted the timeline once again. Agatha Harkness' (Kathryn Hahn) final costume is heavily influenced by Colonial Era covens; a piece of concept art shows off another style.
Marvel Studios visual development artist David Masson posted an early draft of what Harkness' on-screen attire could have been. While the choker necklace remains quite similar to the finished look, the dress design itself has dramatically changed from its preliminary form.
Hahn happened to be in the right place at the right time when she attended a general meeting with Marvel Studios prior to their auditions for the role of Harkness. "[Hahn] has been a phenomenon long before WandaVision, and we were all fans of hers at Marvel Studios. She had come in for a general meeting, coincidentally right around the time we were trying to cast Agnes-slash-Agatha," Marvel Studios President Kevin Feige said. "It was one of those, 'Why didn't we think of this before?' [Marvel Studios Co-President] Louis D'Esposito actually sat down and had a general [meeting] with her, and it very quickly went from, 'She's great! What could she do for us someday? Anyway, who's gonna play Agatha? We really gotta cast this part. Wait a second!' (laughs) It was honestly almost exactly like that."
WandaVision broke the latency for Marvel programming as it resurged after a year-long hiatus due to the COVID-19 pandemic. It also established canonical plots for the MCU through television while toying with past sitcom tropes and styles alike. This limited series, along with Loki (2021-), is a contributing factor that is to significantly impact Doctor Strange and the Multiverse of Madness (2022). WandaVision is now streaming in its entirety on Disney+.