Size information: 4Tsuitable for height 37-41” Age 2-4 year 5T suitable for height 41-45” Age 4-6 year 6 Years suitable for height 45-49” Age 6-8 years 8 Years suitable for height 49-53” Age 8-10 years 10 Years suitable for height 53-57” Age10-12 years Pls refer oursize chart, according your height to select your size; the costumes is loose design. If you are a little Slightly overweight ,you can choose one size up.