This costume runs really small and is more likely a 3T than a 4T. It's a little difficult to get off and on, too. I didn't really like the "ears" either. The hat-style ears are really small and the chin strap is uncomfortable. I ended up cutting off the strings and my son can still wear the "ears" part okay. Cute costume though - looked adorable with his little sister as Minnie Mouse on Halloween.