Down at the excercise yard

Continuing in an oblique way at where discipline came in, the one other option outside of your home was school and for many of us a frequent flash point was PT which had its own part of the uniform and rules were enforced b the PT or Games Mistress

One common rule was we wore gym knickers for exercise in, taking off our regular ones because it was healthier and no shorts.

For a very long time the rule for boys was similar except they were to wear their cotton shorts without any underpants which given the muddy games they played made sense. Anyone who didn't got slippered and that jolly well stung!.
You also HAD to shower afterwards and reapply your regular uniform, often subject to inspection and yet more opportunity to administer swats to your behind.