Common sense = conventional wisdom. They're both wrong reasonably often. Have you never taken an instant dislike to someone within seconds of meeting them? Or indeed, felt a connection with someone you haven't known long enough to have any real bond? These are mostly subconscious reactions to demeanour, tone and (much weaker) dress.

You've heard "First impressions last", right? So obviously we judge people outside of conscious, logical thought processes.

Person and Costume: Effects on the Formation of First Impressions http://fcs.sagepub.com/cgi/content/abstract/4/1/32

First Impressions: Making Up Your Mind After a 100-Ms Exposure to a Face http://www3.interscience.wiley.com/journal/118597412/abstrac...

Confirming first impressions in the employment interview: a field study of interviewer behavior http://cat.inist.fr/?aModele=afficheN&cpsidt=3296559