The difference between humans and animals is that in addition to making and using tools, others will wear clothes with the seasons. The basic function of dressing, in addition to warmth and sun protection, is not to show sexy figure outside intimate partner.
Girls who wear too much clothes in public are generally two kinds of people: those who are engaged in special industries and those who try their best to be famous. Although you can hear ridicule of the poor and nothing from time to time these years, the above two kinds of people are always not elegant.
Advocating dressing appropriately in public does not mean that sex or sexy is ugly. However, sex is private and is not suitable for communication in public.