A size 5T was not available so I bought the size 5. The the suite is a bit large for a child that wears size 5T. I guess the size is a perfect 5, so I will keep it until he grows into it and get something else for the occasion I bought this for. The great thing is that it arrived super early, so I have time to shop around. I gave it 4 stars because of the material. This is a lower-end polyester material, but the suite is low cost so what to expect. It will hold up for the summer, the suite itself is well constructed.