Excerpt from an article, "Would you hire you?" on http://www.thewisejobsearch.com/2012/02/would-you-hire-you.html.

How do you present yourself? While prior experience is important, people get hired based on the whole package. When the personality, style, and image of the person in front of them don't match the words, it creates concerns about the veracity of their answers. If someone portrays themselves as someone that takes initiative and is a "go getter", yet their answers are slow, and awkward, and lethargic, it creates a great deal of doubt. If someone talks about their organization skills and attention to detail, yet looks disheveled and carelessly prepared, it seems inconsistent with their words. While people don't usually get selected because the company is targeting a certain "look", they do expect to see consistency between what is said and how they present themselves. Furthermore, don't discount the importance of "chemistry". Any employer is also asking themselves: "would I feel comfortable working with this person 8 hours per day". It's a legitimate concern. So if your experience matches the position, however, you don't seem to build rapport, it's not likely to be a match.