I kinda hop on this bandwagon to recommend the book "The righteous mind" by Jonathan Haidt, specifically the notion that there tends to be 3 main 'modes' of morality: a logic of individualism (Especially in the western word, and doubly so in affluent classes), the logic of community, and the logic of sacrality.

I feel that this back-and-forth about public pajama-wearing is really at heart a back and forth between a logic of pure individualistic moral (if nobody is hurt, then what's the deal), and more community-focused moral (yeah, nobody is hurt, but it's not bad either to uphold some standards in society).

I've never been to America, and I'm also living in Paris, where clothing is kinda important, but honestly I'm a bit shocked at the idea of going out in public in a pajama. I feel that, unless you're in a really bad place in your life, you should put some effort in presenting a 'good' version of yourself in public, and public pajama-wearing would be a huge signal that you're letting yourself down/are having a huge breakdown, or have mental health issues.