You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: PART: CHARLES 
Clue: In the '80s, he played Charles Ryder, a central character in TV's "Brideshead Revisited"
jeremy irons

Category: MUSIC 
Clue: Webster's defines this word as "a chord of three tones consisting of a root with its third and fifth"
a triad

Category: JACKETS REQUIRED 
Clue: Now meaning any sport coat, it was originally crimson colored when introduced in Great Britain in 1890

a blazer