First off, OP is a seasoned poster. She’s not some newbie, unaware of the range of teen thinking. She changed her original plan but asked here about the mindset- and that’s what this thread has become. Ie, about our different thinking.
The more obvious division line is those of us who’ve been through “young adulthood” and more- and then those here who are still, in some sense, testing their own and others’ expectations. That’s not a critique of either side. Face it, we parents did the testing, too, and didn’t always understand our own parents’ perspective- or fought it. Been there. Most of us were not fuddy duddy conformists. In fact, our era was all about testing, eh?
To (some of) us, this is about what it means to be prepared, even minimally, with respect that it isn’t always all about “me” or what our home friends accept. To others, it’s about laissez-faire self-expression, no matter what.
But this isn’t an “in general.” It’s not about a quick run to the market or dinner after a game or a pizza run from the beach. OP described a particular context.
So I just asked D1 about gym shorts to the college and then a possible meet-up with other adults. She can’t understand why a kid would only take Nike gym shorts to orientation, considering she would be interfacing with adults there. “Was she meeting with professors?” (Apparently.) Like others here, she cited nicer shorts, in case. (I’m not sure my kids could identify linen shorts, but they know what’s a step up from gym wear.) And she said, what if it rained and/or got suddenly cold or was much cooler at night? (Not uncommon in the east, in summer.) Or if some event wasn’t just grabbing a sandwich from some pile? She pointed out that we might go to a nice lunch or dinner, even on a casual trip. Since this was in (or near) an urban location, she asked the “what if” we planned to do something else before going home?
You can take something one small step up. That doesn’t deny the girl her “rights” to define her own casual among casual peers, at casual events.
This isn’t world hunger. This is all very first world. But think abut your own mindsets, not to mention the endless excuses given here.
And no, we don’t know how fancy the Thai place was. Yes, what mattered more was connecting. But the question was about the youthful thinking.
edited typos