It is for teenagers to feel they are one among others and not some alien
Every era has its fashion and we must follow fashion and no be the odd one out but sometimes the odd ones make  fashion.

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Yes,fashion is good in our life because fashion is like mirror of a person it shows how you live and what type of person you are. in modern period where we live now a days a person can guess a character of another person by just his/her dressing sense so fashion is very important in our life which shows everything about you and your character too. 

now a days fashion is changing like speed of light every day we found something new in market and saw some live cartoons which wear some funny dresses and also some are looking good with great sense of fashion. so fashion is not only about wearing dress it is about great sense with awesome dresses which shows you cool in other's vision.