The first rule of casual dress right now is that there are no rules. You can, quite literally, wear what you want and be considered ‘casual’, but therein lies the problem. There is no direction, no predefined set of rules.
Casual dress for men can be traced back to that most stylish of decades, the 1950s. The war was over, and teenagers in the UK and America wanted a something different, a life that contrasted with the austerity of conflict and the boredom of the corporate world. So, suits and the stuffiness or formal clothing were out, and jeans, freedom and rock ’n’ roll were in.