One thing I have learnt about fashion is that however many so called 'rules' there are, there actually are none. When rules are broken so often, there is no point in calling them rules anymore. Avoid wearing double denim is probably the most commonly known fashion faux pas of all time. When Britney Spears & Justin Timberlake attempted to break the rule all those years ago, you would have probably thought the rule was there for a reason. In come the cavalry of stylists, fashionistas, designers, street stylists and style bloggers to find a way to make double denim work.