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Character Development
Daniel Plainview wears hats throughout There Will Be Blood, according to Mark Bridges, the film’s costume designer. This is meant to illustrate the character’s evolution. “Plainview’s] hats kind of echo or illuminate what’s going on with his career and life leading up to the first time we see [the main] hat,” Bridges explains in an interview with The Denver Post. Day-Lewis had a say in which caps his character wore because it was his idea for the hats to have meaning in the first place.