Steve Jobs, CEO of Apple Inc sometimes walk in barefoot in their comapus (I don't know, how I missed this earlier!). They're able to use/market it to differentiate themselves.
Whenever some newcomer or new manager--influenced by British colonial rule, visits our team, they complain about barefoot and casual dressed hackers. For years, I have been defending that they're not intentional but they're geekish. Had I known this earlier, I would have compared Apple Inc culture with our team!
Not to mention that our Online Marketing Manager (who's from London but working in Chennai) never wears suit or tie. He once told me that he wears suit only on Christmas dinner and for funeral.