At the time, Whedon’s promise must have come as a bit of welcome reassurance, but Olsen was keen to get into a Scarlet Witch costume by the time filming on “WandaVision” rolled around. The way Olsen tells it during a January 2021 interview on Vanity Fair’s “Still Watching” podcast, she actually fought for the chance to wear the old-school Scarlet Witch costume. It’s unclear if there was a specific reason for her new stance on wearing a costume some would generously describe as “skimpy,” but her account of the conversation reveals her excitement.
According to Olsen, “We have a Halloween episode and they were trying to figure out how big of a nod to the character we were going to do and it didn’t start off with the classic Scarlet Witch costume,” and went on to explain, “I like fought for it. I was like, ‘No we have to go full into it. This is like the greatest thing. Paul [Bettany]’s doing it, I’m doing it.’ And I’m really in it, it’s not just a flash. I’m really in the costume for quite a bit. It was so fun, I loved it. And it was the perfect way to wear that costume, because you can’t take that costume seriously.” She also added that she joked with the production team to “make the headdress as big as you need to. Massive.”
In the end, seeing Wanda wear the ’60s Scarlet Witch costume in the “WandaVision” Halloween episode was not only a fun Easter egg for MCU fans, but helped add richness to Wanda’s development into the actual Scarlet Witch.