It is made with a double layer of fabric (ie it is lined). I used fabric from my stash, so lined it in a plain green. The back view is below. This size should fit a 6-10 year old I think.
I think it is a great design with clear instructions. I reckon it will be comfortable and easy to wear.
I hope to try it out on a child tomorrow - and see if there is demand for more. I have just about enough crocodile material to make another one.