School uniform

One notable difference between natural fibres and petroleum based ones is that most natural are naturally antibacterial. Wools can be hung out and can clean themselves. I buy Ecozero washing liquid (allergen free) and pop everything in a cold wash so nothing shrinks. Well-made clothes last much longer and are much better environmentally as well. 

Thank you for the suggestions, that's very helpful and I can see that there are some websites with 100% organic cotton uniform which I know is much softer, only issue is it's much more expensive and not sure how long it will last.  But I'm sure it will feel nicer than the polyester / plastic variety

I'd suggest looking online to see what's available and you can also ask in local clothing shops and I'm sure they will be happy to assist you with this and will be able to say a lot more than I can on it.

I would suggest doing a search to find 100% cotton, marino wool or even natural tree fibres like bamboo. Other natural fibres like flax, linen, viscose and other sheared animal hair or even silk are all human-friendly. Polyesters and nylon being made from petroleum are basically a form of plastic - the skin cannot breathe in these. I try to stay away from blends even as much as possible. 

There are many shops who will sell these, but it might be easier to know how to look if you ask for natural fibres :) 

Have you googled? A couple of the high street stores/supermarkets sell sensory uniform but I can’t remember who. Might have been M&S and maybe Asda