Don't buy anything she's worried to get dirty, Ive seen children not want to get involved in activities because they are worried they will ruin their clothes, this goes for school coat too, it's worth having two incase they misplace or soak the other one.
I buy 5 school jumpers, 3 her current size and 2 the next size up. That way there is no stress in the morning as there is always a jumper available and then when she grows out of the smaller ones I buy the next size up.
I buy from M& S easy dressing range, partly because I hope that demand for them means they extend there range for people with disabilities but also it is much easy for Dd to have a shirt with velcro than buttons.
Dont send her in in tights on PE days, it'll take her forever to get dressed. Also tights are tricky for little ones to pull up properly so she'll be uncomfortable, I'd opt for trousers or skirt and long socks untill the colder months.
DD likes Jersey school trousers, they are pull on and very comfortable, we get them from next as they are thicker and better for winter but Sainsburys also do them and are much cheaper.
Name tags are great and really do stay attached and they do stickers for bottles and lunchboxes that are great. I'm still using the same pack I bought when DD was in nursery and she's going into Yr 6.
'Girls' shoes are rubbish, they are often open topped so get wet when it's raining and wintery and are rubbish for running around in - no tips for this it's the way of the world if you find the holy grail of a practical shoe perhaps buy it in multiple sizes.
DD can do her laces with no problem but she wears brogues which are tricky as she has to loosen them all the way down and kept getting told off for being late after changing for PE so we got some silicon, no tie laces from amazon which are great.
Avoid white socks, they will not survive, Dds were always stained with mud after the first wear and looked tatty. You can buy black frilly ones which are far better.