As commented by previous reviewer sizes quite small. Ordered 2 for size 5-6 and 7-8 for my 6 year old who is quite small but kept the 7-8 jacket. (Don't forget if you do this that you need to pay postage for return).
Jacket very warm and totally rainproof. Very pleased with purchase
I bought this Jacket for my 3yr old son to wear on a walking holiday. I initially bought size 5-6yrs but it did not fit him so I had to re-order a 7-8yrs which is fine. My son is rather tall for his age, but I felt the first size of jacket did come up small. Either colour (Black or Eclipse) will be good for school. The Jacket includes zipped outer pockets and a good sized hood which withstood a downpour well. I would recommend this product to others.
I read the reviews on here before buying and I ordered age 9-10 for my 6 year old daughter and it fits her perfectly with room for growth, so you definately need to buy bigger than the age you're buying for. Saying that it is a good quality, waterproof jacket.
This is a great light weight waterproof jacket, but I am glad I ordered two sizes too big. I would recommend anyone to do the same, to save you money and time returning it for a larger size. I have no complaints about the product, great at the price, but watch the sizes.