Why do the greasers wear there hair long?

The greasers in the novel "The Outsiders" by S.E. Hinton wear their hair long as a symbol of their nonconformity to societal norms and their rebellious attitude. Long hair was associated with a countercultural movement during the time the book is set (1960s), and the greasers use their appearance to express their dissatisfaction with the expectations placed on them by mainstream society.