Francie Fairchild was a fashion doll issued by Mattel from 1966 to 1976 and re-introduced in 2011.
Marketed as "Barbie's MODern cousin", the doll had an extensive line of "mod"-style clothing, often employing bright colors and geometric patterns similar to fashions associated with Carnaby Street in the late 1960s to early 1970s. At 11¼ inches tall, the Francie doll was shorter than Barbie, but taller than Skipper, making the character presumably between the two in age.

Casey is the first friend of Francie.
The second doll in Francie's size, Casey, was issued as "Francie's Fun Friend" from 1967 and came in blonde and brunette. That same year a Twiggy doll {based on the famous fashion model} was also made, resembling Casey but with heavier painted-on "makeup". The Twiggy doll was made through 1968, and Casey through 1970. Casey returned briefly in 1975 as "Baggie Casey", but she was made with the same head mold as Francie.

Vintage Twiggy Dolls were issued from 1967 to 1969
Twiggy was (based on the famous fashion model of the day) resembling Casey but with heavier painted-on "makeup".