Kitted 3 kids out with full brand new school uniforms this Sep.
For the main everyday uniform followed it to the letter buying all the jumpers with school emblem on, correct colour trousers, skirts, shirts, trousers, shoes and ties.
Bought all the correct PE T-Shirts (and rugby shirts) with school emblem on.
Bought DS1 "correct" school navy shorts for PE and plain navy blue socks and navy blue trakkie bottoms both of which are not from the uniform shop apparently are not allowed.
DS1 has been told if he does not have the correct gear by next week he will get a detention and was made to do PE in his shorts and t-shirt today outside 
AIBU to feel pissed off he was made to do it in the freezing cold in a t-shirt and shorts when its 0 degrees here today and pissed off that what I have provided is only PE kit and is the same as the school stuff just half the price.
Where do I stand here and AIBU?