I bought this costume for my 2.5 yr, rather tall-for-her-age daughter. The costume is cute and well made. The costume is listed a size 2, waist 29 inches and size 4, 30 inch waist. I bought the size 2. It was very short for my daughter. The O site does not list all the details of the sizing that is on the product. Had they included that, it would have prevented the wrong size. The size 2 is for children upto height 33 inches and size 4 is up to 40 inches. O's customer service was superb, they provided me the free shipping when I pointed out the inadequate info. I sized up to 4, and that works wonderfully on my daughter.