My daughter adores "Hello Kitty" so when I saw the "Hello Kitty" rash guard I thought it would be a perfect way to protect her skin from the sun and find a rash guard she would wear. My daughter is three-years old, but very tall; she''s a solid 4T.  So...planning for the summer beach season, I ordered the 5/6 rash guard. Holy cow! When it arrived it barely fit. It was snug all around. It is February; there is no way this is going to fit her come June. Who knew I''d need to order a 7/8 for a three-year old? Something is definitely wrong with the sizing on this product.