sentences:  Examples include Vogue, Harper’s Bazaar, and Cosmopolitan.American fashion design is highly diverse, reflecting the enormous ethnic diversity of the population, but is largely dominated by a clean-cut, urban, hip aesthetic, and often favors a more casual style, reflecting the athletic, health-conscious lifestyles of the suburban and urban middle class.Many American fashion trends are defined by teenagers, a generational distinction first named in the US in the 1950s.