I was wondering this very question to myself the other day. Dressed in somewhat tight ripped up jeans, a charcoal sweatshirt with holes in the sleeves, my hair in my face. This is how I dressed when meeting up with some friends at the local mall. Upon arrival I had been asked several times by different people if they could "give them a drag" unaware I'm fully straightedge and do not carry cigarettes on me. Slightly annoyed I entered anyways. I smiled holding the door open for a mother and her two daughters, both about my age. The mother gave me an odd look saying "Thank-you....?" Though, her daughters both dressed in total Hollister clothes, brightly exclaimed "Thanks!" Is it that today's youth is less judgmental of appearance? Or is it that the aging parents are becoming more paranoid of who their children might become if they let them dye their hair, wear black, listen to metal, etc...?
I attend a public school in the United States. The majority of kids there are Hispanic, where White kids are the minority. I noticed that if you attend this school and you are Hispanic you most likely wear baggy pants, flat rim hats, baggy shirts, have your hair gel'd in some way or another, and listen to rap, hip-hop, or pop music. If you are White you probably wear tight clothes, studded belts, tons of bracelets, have long dyed hair, and listen to rock, indie, or metal music. Dispite the dramatic difference in cultural styles, we all get along well as both friends, and lovers. We give conversation, trade numbers, and share lunch tables. Is this social acceptance because the youth of today has put aside differances, and learned to accept common intrests they find if they actually take the time to learn they share? I believe so and I do not think a person's style should effect who they choose to be in life.
Personally, I DO dye my hair, wear black, listen to metal, etc. But I would not consider myself at all a bad influence to perhaps a younger age group. I love working with kids, I do volunteer work, and do not like to affiliate with drugs. But does this show through my clothing or what I listen to? Not exactly. If I really was looking to reflect this, I'd present myself more conservatively and more formally, rather than uncaring. I think adult, especially parents, are a little over concerned with teenagers. Of course they should be involved and try to influence their kids to STEER them in the right direction. But this should not mean they must shove a certain appearance down their throat. Simply to guide, while avoiding tampering with their children's "freedom of expression." (in America at least)
What do you think a person's "Dress Code" says about them? Do your clothes define you?

<3 With all respect from Mora <3