Why is secondary school uniform so prescriptive?

[YouWereGr8InLittleMenstruators]

DD1 has been allocated a place at a school she is looking forward to attending.
She has mild SEN (diagnosed) and suffers with school anxiety and some specific sensory issues related to texture and fit of clothing and footwear. Nothing to do with appearance or fashion, has been the same since KS1, and doesn't change when she's in home-mode; same preferences and requirements apply; wierd stuff like having ankles supported and not tolerating anything tight around her wrists. Never, ever been able to wear tights, but will happily wear leggings and socks.
In primary we have been able to work around this and find uniform solutions which comply with her school's uniform policy but ensure she doesn't freak out in the mornings.
I have just downloaded the uniform policy of DD's new secondary school and I can see straight away that there are a few 'non-negotiable' items which will cause us hell in the implementation. In a panic, I have looked at other local secondary schools' uniform policies, thinking we might have to re-think our offer, but they're all similarly restrictive and prescriptive.
Anyone with experience of approaching new uniform requirements with kids with sensory issues?

The uniforms are prescriptive because it reduces the ability of stroppy teens to argue the toss about them.

If your DD needs adaptations, then talk to the SENCO about options

So kids don’t turn up in black joggers / jeggings claiming they are in fact smart school trousers but agree with pp speak to the school now about how the school can support your DDs needs

Which items will she struggle with?

Reasonable adjustment certainly comes into it as long as the adjustment needed is reasonable! Ds is starting in September and needs to wear boots which goes against the uniform policy but they will allow for him. Same with PE he won’t wear shorts so they will let him wear tracksuit bottoms instead

Hi op, under law school is supposed to support dc with sen around uniform.
It's very wide known now how it can cause dc issues.
SENCO at school should be able to help you work around this. Definitely do not accept loosing a place over this.

I think talk to the SENCO. You have made some comments that suggest you are willing for the principle of uniform and the adjustments are in the spirit of one.

In addition to the comments about strict uniform being because of all the excuses teenagers come up with, there are still some in education who think being strict on uniform sets a tone of behaviour in other ways.

My (autistic) daughter wears a few non official uniform bits (polo shirt instead of regular shirt). She never wears the tie which she is meant too and generally doesn't take her blazer (they don't have to wear them but are meant to have them with them).
Quite frankly if the school want her to attend then this is what she is going to wear. I have given up caring what people think. It took years to get her autism diagnosis thanks to a useless senco at primary. Her secondary is a lot more helpful thankfully and we have a lot of support from the senco. She needs an education. She needs confidence and to learn independence. She doesn't need to be wearing a fricking tie.
Talk to the senco. If they completely refuse to budge on the issue then I believe that's a sign that their attitude to sen is bad - and that would give me cause for concern.