Does fashion dictate what is worn on the streets or is it vice versa? Actually both are true to a certain extent. Fashion cannot exist in a vacuum and does consume ideas from the street and what is worn on the streets is also dictated by fashion. Like there are some ingenuous people out there who have come up with cool DIY fashion ideas to try this year, which can be taken as street fashion in a way.
Or sometimes the rules of fashion can be quite rigid causing people out there to break free of some of the shackles and come up with their own take on them. Take for instance the 20 fashion rules to be broken this year. Obviously this is not simple fashion rebellion but street wise thinking that takes fashion rules, examines this and evaluates whether this rule can be followed or not.
So we can say that street fashion and high fashion are actually inextricably entwined with one feeding off the other to grow richer. Many a times you will find some really cool fashion ideas right on the street and the fashion industry leaders are aware of this. That is why they are out trawling the streets looking for inspiration. One just has to look at the birth of the never fading trend of jeans in its many manifestations to know how cool street fashion ideas can be.
Or take for that instance of the three fourth length pants that was possibly a fashion trend picked up from some practical soul on the streets who cut the pants short to avoid the bottoms getting wet. This is a major fashion trend that has become a hit. Or even the tying of the ends of shirt at the midriff could be derived from the streets based on practicality than mere fashion.