Why do so many parents seem to allow their female children to dress like they are on offer?

I just got back from work. Today one of my co-workers was looking at a girl. She had a leather mini-skirt on, belly button showing, tight top, loads of makeup and jewelery, and was generally done up the same way girls in clubs are.

I estimated the girls age at 17 (legal in Spain), my other co-worker estimated her age at 19 or 20, and the co-worker who had his eye on her thought she was 18 or so.

My co-worker walked over to her and started a conversation, she had a smile on her face, and so did her parents. I then saw my co-worker say something, and everyones faces changed. It turns out the girl in question only just recently turned 13 years old.

I have no problem with girls dressing however they like, and even think it’s ok for kids to dress up a little from time to time.

However, had I have been the father, she would have not been dressed that particular way.

Are some parents just oblivious to what their kids look like some times? or just past caring? or perhaps some other reason?