You know what - this whole issue is one of the reasons my DD is going to the school she is and not to the other, better-rated-on-paper, school she was offered.
The Head of her school is practical. Yellow polos not wearing well....? Fine, chuck 'em, wear white. Grey pants a bind to find... black's fine.
Shirt and bleeding tie on a four year old who's got enough bloody challenges ahead starting school...? She wouldn't even dream of asking for it!
Yet she's ruthless about blatant breaches - no trainers, no wild hair colours, no leggings etc - but basic uniform, she's completely sensible.
The school do insist on logo'd jumpers/cardigans etc (unless medical issue) - but they're bought by the school, sold on at cost. There's also about five options and styes, including a fleece. They're cheaper than BHS/Marks etc, and better quality than Asda and the like. DD's from Nursery still look new, despite a year of wearing, washing and tumble drying.
The result - a school that looks homogenous and smart without stupidity!
If she can do it, for a school with 450 kids in a not-great catchment, at the same time as taking it from being in Special Measures to being the top-testing school in the LEA for KS1 and 2, in two academic years - why on Earth can't everywhere?
I'm a fan of school uniform, but not when it's expensive, deliberately uncomfortable and impractical. Not in Primary!
OP, speak to the Head and explain. Hopefully, they'll be like our lovely Lady, and they'll see the need for an amendment!