Darth Vader is one of the most memorable villains in Star Wars.and, arguably, cinematic history, mostly because of his iconic look. His black armor, which encases the burned and brutalized body of fallen Jedi Anakin Skywalker, projects menace and strikes terror into the hearts of rebels and Imperials alike. Between the sonorous repetition of his breathing and his intimidating height, Vader represents power and villainy from every angle.
Source:https://www.cbr.com/darth-vader-sith-drugs-cape-purpose/