This costume is really cute, and my daughter loves it. She found the little "magic" sound effect button on the sleeve before I even had it all the way on her. You can't see in these pictures, but on the back it has a fuzzy tail and mane and a set of iridescent wings. It zips up the front and has little elastic bands under the feet instead of being footed. She is between a 2T and 3T right now, but I ordered a 3T. I'm glad I did, because the torso is short in this costume. It's almost too short for her, but the sleeves on a 4T would have been way too long. The material is extremely thin and see-through. It will be fine as long as we put a light colored solid tee shirt and pants on underneath. Anything with a print on it would show through this costume. Thin material is fine if you live in a warm climate like we do, but just be aware if you live in a cold climate, you will have to bundle up your little one if they wear this costume.