I bought 5T and the tag says 5T. This is the official adidas logo t-shirt. The shirt is slightly longer which is perfect for my child to wear longer but the shoulders are fitted. I think it's best to wash it in cold water and tumble dry low according to the instructions. All in all there are many fake adidas t-shirts on the internet and this one was filled in and sent out by Revain and is the official adidas shirt for those who are wondering.