Beau Brummell, e.g., 3 letters
Dandily dressed dude, 3 letters
Fashion-obsessed gent, 3 letters
Fellow like a dandy, 3 letters
Metrosexual, perhaps, 3 letters
Peacockery displayer, 3 letters
Well-dressed fellow, 3 letters
A man who is much concerned with his dress and appearance, 3 letters
One who's crazy for a sharp-dressed man?, 8 letters
Reminiscent of Beau Brummell, 7 letters