Short skirts

Was out with the wife today and as we we're driving home I was happily looking at how short the skirts of today's school uniform is.
When my wife said this

Look how short those skirts are, when I was at school your skirt had to be below your knee.
If it wasn't you'd either get sent to the head and punished or sent home with a letter telling your parents that your skirt wasn't long enough and likely as not get the backs of your legs smacked by your mum.
Especially if you'd been sent to the head!

Just wondered if this had ever happened to any of you and what punishment you got. .