Check out some of these pics. http://www.boredpanda.com/1969-hippie-high-school-fashion-photography/

1969 high school kids (or are some of them models, it looks somewhat staged) dressed different in California compared to mid-60s west coast where I went to school, we weren't allowed to wear pants to school, and shorts would be a huge no-no.
There was a huge difference in what attire was allowed in school just between 1968 and 1969. I graduated in 1968. We were only allowed to wear dresses or skirts to school. But oh,were those skirts getting short! I think that`s when they gave up. In 1969,the girls were allowed to wear pants. I was mad,lol. I had always wished we could wear pants and I missed it by a year. But we had already started wearing the beaded vests,the headbands,all the hippie garb. The girls in many of these pics do look like they could be models but if you know these high schools-namely Beverly Hills High and Woodside High,these schools were in very affluent areas. These girls had money-or at least their parents did. They could afford to dress like models.