Tbh, school pettiness over uniform is not new.
It’s not, and people LOVE it. Every time there’s a story about someone missing a day’s school because of some tiny uniform infraction everybody says “quite right, rules and rules” and talks as though wearing socks with bows on will lead to the collapse of civilisation.
And here we are, with a girl wearing a skirt that is literally indistinguishable from the “correct” one, and people are more troubled by her mother being overweight and too lazy to take in the waistband than the fact that her teacher lifted up her shirt to look at the label of her skirt.