Asda polo shirts are V cheap - but they don't wash well and they seem to stain at the drop of a hat. Or maybe I'm rubbish at laundry.
Sainsbury's clothes - good value/good quality. Sells out INCREDIBLY quickly and unless you do get stuff now, the size you are after will almost definitely not be there when you want to buy it. Sigh.... or maybe I'm disorganised AND rubbish at laundry..
Tesco - not much experience of their school clothes - not near enough for me to think about a special trip for school clothes, to be honest. Or maybe I'm lazy, disorganised and rubbish at laundry...
Next - good quality, not cheap. And sometimes guilty of "fancyfying" things a bit with too much embroidery (for girls!) etc. They DO do slim fit though, which is v helpful for my skinny little rabbit (son). Or maybe I'm frumpy, lazy, disorganised and rubbish at laundry....
M&S - top notch. Good quality - comparable prices to Next or sometimes cheaper with their occasional offers. Washes BRILLIANTLY. Would buy it all the time every time if my v limited budget would stretch to it. Or maybe I'm tightfisted, frumpy, lazy, disorganised and rubbish at laundry...
School shoes - always buy the best you can afford. Sacrifice all the rest of the clothes (bar winter coat perhaps) in order to buy the best quality shoes. They get scraped, scratched, worn through, soaked (puddle jumping...sigh!), scuffed, bent, and generally treated with contempt, but they HAVE to stand up to the job for as long as they fit the child concerned.
Also, it's very worthwhile investigating whether (once your child's settled into school and you don't aspire to them looking perfect every morning!) the school has second hand uniform sales, or whether you can find decent preloved stuff on Ebay/Gumtree, etc. Ebay has been BRILLIANT for winter coats for me.
HTH!