Romantic lead, fighter, undercover agent and ambassador Nakia (Lupita Nyongo) dresses exclusively in shades of green, almost like a chameleon, each hue worn only once. Its not only nailing one character, its nailing several in one person, says Carter. Ruth, Ryan and I wanted Nakia to look both elevated and grounded in her work as a spy and each costume reflects those things, says Nyongo, who dons a body-hugging, techo-look chartreuse neoprene gown for a glamorous casino scene. Neither aesthetic nor utility were compromised.