He said, the shape and style of a person's hair to show his personality. If the hair tangled, tousled not been combed, not ever in shampoh dirty, then it is likely that person adopts a life is not good, or does the person not so concerned with the importance of cleanliness and tidiness.
It's not everybody, because sometimes a person's physical form does not always indicate a person's lifestyle. It could be the person in disguise, pretending to be dirty and scruffy style. And there also is a rich-looking thugs, but his wealthy angel.