Stranger Things has utilized many wigs, but Brown's curly hair in season three was her own. "Millie didn't get a perm—her hair is naturally curly!" Hindsgall told Insider. "I wanted something childlike and natural. Millie's hair is scrunched up and she goes. I didn't want to touch her too much this season; I wanted her free. People shouldn't bother her this season because her character has an arc and numerous emotional sequences. Giving her calm was my goal."