What is "crissy"

Crissy is an American fashion doll with a feature to adjust the length of its hair. Crissy was created in the Ideal Toy Corporation's prototype department in 1968. She has auburn hair and is 18 inch (360 mm) tall. While having stationary foundation or base hair rooted to its head, the Crissy doll also had another adjustable thick strand or lock of hair that emerged from an opening in the top of the doll’s head, giving it the ability to adjust the length of its hair so a child could choose to make the hair short or long.