My ds2 is very funny about clothes and insists on wearing jeans and long sleeved tops (ocassionally he will wear a t-shirt) even when it is really hot. He is 5 and suffers from prickly heat very badly, but despite this refuses to wear what I consider to be summer clothes.
Anyone got any suggestions. Where we live there are quite a few indian (please don't take offence if I have used the wrong term - they are from India though) children who wear lightweight trousers and tunics. I thought something like that would be good, but haven't been able to find them when I search as I'm not sure what they are called. They look very lightweight fabric, even thinner than cotton I'm familiar with.