Tips: The size of this girl princess costume RUNS a little BIG, before purchase, please according to our size chart to choose the fittest one.The size 3T= 3-4 years, 4T= 4-5 years, 5T= 5-6 years, 6 Years= 6-7 years, 7 Years= 8-9 years, 8 Years= 9-10Years.