fop

fop \FOP\, noun:

A man who is overly concerned with or vain about his dress and appearance; a dandy.

I wear ties because I don't have to, because in an increasingly dressed-down, homogenized world, they can set you apart. I wear ties because they nurture the inner fop. Also the outer one.
-- Abbott Combes, "Secrets and Ties", New York Times Magazine, November 14, 1999

He's swaddled in a heavy black wool overcoat and his shoes are silver-buckled with cap toes, the black leather well taken care of. He's a bit of a lounge lizard, a hip-hop fop.
-- Po Bronson, The Nudist on the Late Shift

Fop comes from Middle English fop, foppe, "a fool." The adjective form is foppish.