I am 72. I remember wearing pants to school in the 6th grade. That would have made me about 10. No one ever said we couldn't wear jeans. I wore them all thru school. I did wear dresses or skirts with crinolin petticoats too. And bobby sox and saddle oxfords. In the 60's the place where I worked burned to the ground. We set back up in a cold cold warehouse. At that time we only wore dresses to work. One day I decided that it was just to darn cold to wear a dress so I wore a pair of wool pants. Other ladies started wearing them too. Then when the business was up and running and it wasn't cold any more, we just kept wearing pants. No one ever said anything about it so we just went on wearing them.