I would have to say it runs small for a 4t in length. But then all of my little ones are the long and lean type. My 5yr old can still wear 2t round the rump and top but we have to go to 5t and 4xs to get anything long enough. She can still get it on but it's way too short. It is cute. I think she wore it one time. I will have to look at it again I cannot remember the brand. It was not new when she got it but its still in very good condition. Ill get back on the brand.