The good or bad impression of a person can influence our feelings and thoughts about this person's character. For example there are recommendations like this: if you go to the job interview you should dress well. Why? Because your interviewer will most likely extend the impression of your suit or dress to your skills.
Background is commissioned by AlexSvar.
“The Halo Effect: Evidence for Unconscious Alteration of Judgments”, RE Nisbett, TDC Wilson, Journal of Feisonality and Social Psychology, 1977