When did it become acceptable to go out in pyjamas?

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For context I live opposite a school and my work desk is at the window that looks out to the school, it means I can indulge in a bit of casual people watching while daydreaming and pretending to work.

I've noticed a large number of mums (never dad's weirdly) who turn up in pyjamas, big puffy coat, and slip on shoes or slippers for the 9am school run. I know everyone's situation is different and there are many many reasons why an individual finds themselves in this situation but I'm more interested in when did we become ok with it? I don't remember any parents in pyjamas when I was at school nor when my children (youngest is 16) were at primary school so is this a new phenomena?

I was going to make a snobbish comment, then remembered that I have habit of going down to hotel breakfasts fully dressed but wearing furry slippers.

It's a bit scruffy imo but some people might have a good reason for it, so I don't want to be harsh.

No excuses for wearing pyjamas. It gives the impression that intimate body parts are unwashed. (Back and front).

Does it really reduce the amount of laundry though ? You hardly sleep in a pair of pj’s, wear them during the day and again that night.

You could easily wear a pair of pj’s for several nights, have leggings and sweatshirt for day-wear (you could wear same set for a few days) and it would also reduce frequency you’d wash your bed-linen.