We are walking advertisements...

Our body language is a display of our motives. We are like walking advertisements for what we are thinking or feeling.² Each of our behaviours is a way of alerting others to our inner workings. It is also a way of eliciting a response in someone else. We act; they react; and so on. For example, if someone smiles at us, we typically respond with an action of our own. Therefore, communication has started, just as in a ‘normal’ conversation
So, if you’re your own advertisement, how can you guarantee to be a best seller? By being aware of what language your body is talking. For example, how do you sell yourself during an interview? Start with the packaging. Clothes can make an important statement. Do you want your potential boss thinking ‘are they here to work, or did they get lost on the way to the beach?’ or ‘neat, smart and personal, just what we’re trying to say!’? Once you’re packaged appropriately, it’s time to concentrate on what’s underneath the wrapping. Nerves have a way of making the body act in certain ways, and they can be pretty sneaky about it. Watch the nervous foot bouncing, it’s letting everyone know your heart is going a mile a minute. Don’t barricade yourself in with crossed arms, be open to new experiences. Make eye contact! Sure, you may be feeling nervous, but you want to think confidently, and this is the message you need to send. Use the language of the body to impress your interviewer. Make it work for you.
http://www.abc.net.au/talkitup/talkitout/bodylanguage.htm