We must live in two different worlds. I don't know anyone who doesn't live in jeans and sneakers.... Unless it's the men in uniform at the nearby army base. And this us coming from a grandmother not a teenager
I'm just a young fogey. At work we went dress casual a few years back, and I still come in wearing a jacket and tie, even on Friday when jeans are allowed.
There's a hilarious film from the 70s starring Martin Mull, Tuesday Weld, and Sally Kellerman called "Serial." In a scene where Kellerman is hiring a new maid, and tells the woman she doesn't want her to wear a maid's uniform, only regular clothes. The maid says "So, you want it to look like I'm your friend who stopped by to chat, and I just happen to be cleaning your house?" "...exactly."
That seems to be the way the world's going - everyone wants to look like they were doing something else, and just happened to stop in and hang around the office for 8 hours.