One of my favourite eco fashion brands for children is the Danish brand Popupshop. Their goal is to create 'timeless organics'. I have bought the Leopard Stockings for my daughter Suki. She looks lovely in them and they are very comfy too!
Popupshop are true social and environmental entrepreneurs: "Our pursue is to make a fair product both for the customer and for the people involved in all stages of production". That's how I like it!
Also check out their women's collection.