I am not sue about tawse-proof knickers, but how about smack and slipper-proof gym shorts. At my school if any girl played up during a p.e lesson then our gym mistress would lift up the back of our gym shorts and deliver 4 real stingers to the top of each bare upper thigh in front of the class and sometimes follow it up with a 6 stroke slippering across the bottom in the change rooms. However I think titanium gym shorts would have been a bit obvious.

 

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