The patent for a grow hair mechanism awarded to Ideal in 1971 and attributed to inventors Francis Amici, Robert David, and Richard Levine is scarcely different from the original invention used in the 1963 Tressy doll.

The design of the knob and the body mold form a one-way ratchet which along with internal spring tension serves to hold the hair locked and stationary.

The 1970 model of the Crissy doll had better hair quality, a new aqua mini-dress, and a new box design to depict her attire.

Not only were new models added to the expanding family, but by using new designs and mechanical gimmickry the dolls started "doing things."

This doll, who came wearing a jewel-toned taffeta floor-length gown, was different from previous Crissy models as it employed a mechanical apparatus, set in motion by pulling a pull-string.

[citation needed] In 1973 Ideal released "Beautiful Crissy with the Swirla-Curler.” This doll came packaged with a hair curling attachment designed to be inserted into the head's opening.

This Crissy model came wearing a one-piece dress that was fashioned to look like a white-and-orange plaid jumper with a red-orange blouse underneath.

In 1970 Ideal produced another 18-inch (460 mm) tall doll which shared the adjustable hair feature.

The Kerry doll has blonde hair and green eyes and was only released in a straight body style.

The Brandi doll had tanned skin, blonde hair and painted blue eyes.

The Dina Doll had a tan, blonde hair and painted blue eyes and was only released with a Posin’ body style.

Also considered by some collectors as a Crissy "family" doll was "Posin' Cricket" a 1971 Sears catalog exclusive.

Crissy's smallest cousin was “Velvet's Little Sister” (1972) a 12-inch (300 mm) strawberry blonde child doll.

A “Baby Velvet” doll was a proposed model that was pictured in Ideal's 1974 catalog but never made it to the production stage.