'WandaVision' director says Elizabeth Olsen's input is the reason the Scarlet Witch costume can 'actually function'

• Warning: There are major spoilers ahead for Marvel's "WandaVision."

• Director Matt Shakman said Elizabeth Olsen gave her opinion on the Scarlet Witch suit design.

• Shakman told Entertainment Tonight that it was important for the costume to be functional.

• Visit Insider's homepage for more stories.

The "WandaVision" director Matt Shakman said Elizabeth Olsen gave feedback on her Scarlet Witch costume when she tried it on for the first time to ensure that it was functional.

"She is so practical that she immediately put it on and she was like, 'OK, I can do this move and I can't do this move. And I need to be able to do this move,'" Shakman said in an interview with Entertainment Tonight this week.

"We were like, 'Great!' So then we have to re-engineer it, because those suits are tough," the director continued. "I mean, it's one thing to look amazing. It's another thing to actually function."

Olsen's character, Wanda Maximoff, first appeared during the end-credits scene of 2014's "Captain America: The Winter Soldier."

The character properly made her Marvel debut in 2015's "Avengers: Age of Ultron" but was never referred to by her superhero name from the comics.

Episode six of "WandaVision" showed the titular heroine dressing in a comic-book-accurate Scarlet Witch costume, though she said she was pretending to be a "Sokovian fortune teller" for Halloween.

In the penultimate episode of the series, Wanda was finally given her comic-book name, Scarlet Witch.

And in the finale, which was released on Disney Plus on Friday, Wanda fully transformed into the Scarlet Witch after an explosion of chaos magic during a fight with Agatha Harkness.

Olsen's stunning deep-red suit was sneakily teased in a promotional poster for "WandaVision." The silhouette was shown during episode eight. Fans got to see the full glory of the outfit on the finale.

Viewers also pointed out that the suit had nods to Vision's cape pattern and the Mind Stone.

The outfit's color scheme and style are also reminiscent of Michael Fassbender's Magneto costume in the "X-Men" movies. In the comics, Magneto is Wanda's father.

Shakman told ET that because Olsen had spent years portraying Wanda and donning different iterations of her superhero costume, she knew exactly where adjustments needed to be made so that she could move properly.

"She's so adept at the physical work - she's beyond adept at every part of her job - so she was quickly picking apart how it would work," he said.

Olsen has previously discussed the evolution of her outfits. In an Elle interview in 2018, she expressed dissatisfaction with how revealing the corset that she had to wear in "Avengers: Infinity War" was.

"I like corsets, but I'd like it to be higher," the actress told Elle of her costume's low neckline.

Olsen said her Marvel costars Tessa Thompson (Valkyrie) and Scarlett Johansson (Black Widow/Natasha Romanoff) wore outfits that weren't as revealing.

"I would like to cover up a bit," she said. "It's funny because sometimes I look around and I'm just like - wow, I'm the only one who has cleavage, and that's a constant joke because they haven't really evolved my superhero costume that much."

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