It's also a 'you don't have to worry about me being a weirdo' shield - if you're talking to people who wear suits, and you're wearing jeans and a teeshirt, you can only say really conservative things to them. Dress like them. however, and you can get far more interesting things out in front of them.
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I don't know much about Peter, but he wears his hair long, goes to music festivals and may very well be a pagan.