I have no experience of private schooling.
My 3 children attend the local state primary school. It's disorganised chaos on a good day and communication is utterly dire. The uniform policy is ridiculously strict: shirt and tie, itchy knit jumpers, tailored trousers, socks must match trouser colour and coats must match jumper colour. Hair tied up at all times.
Recent Ofsted was "outstanding" and the SATS results are consistently in the top 5% of the country.
There are children in each of my childrens classes who don't wear the uniform, don't own school shoes and do not wear a coat in winter months.
There are children who turn up to school with dirty faces and messy hair. There are children with very poor personal hygiene.
There is a child who wears the same boots all year round since starting school, they are obviously several sizes too big and the laces have fallen out long ago.
There is a child who wore their father's shorts to every swimming lesson.
I could go on and on but you cannot judge a child or a school on appearance.
Young children don't have a say in how they appear, or whether their hair and clothes are clean or their shoes are polished. They are children. There may be other reasons as to why a child appears untidy; they may not tolerate their hair being brushed or the feel of their school uniform against skin.
Their parents may not have been taught basic skills, they may not afford uniform and haircuts or they may just simply not care!
In our experience, these "non smart" looking children are of the kindest in the class with great morals and values. They're the children that others want to be around because of who they are inside, not their exterior.
These children are turning up every day to access the national curriculum that they're entitled to and that is all that matters.