PJ Dolls were introduced in 1969 when Barbie's Friend Midge received a makeover and a new name. Using the same Midge face and head mold, PJ was more hip and mod than Midge. PJ had long blonde pigtails, brown eyes with blue eye shadow and wickedly long rooted eye lashes.
Talking PJ was introduced in 1969, Twist 'n Turn PJ followed in 1970. She has the same body as Barbie and shares Barbie's clothes. The only clothing items that has a PJ label were PJ's swimsuits and the items from the two gift sets.
Talking PJ was the first PJ - she was released in 1969.
Twist 'n Turn PJ was introduced in 1970 and was manufactured through 1971.
Live Action PJ
Live Action PJ was released in 1971 along with Live Action Barbie, Christie and Ken.
Sunset Malibu PJ
When Malibu PJ was released in 1972 she had a glamorous new look.
Beginning in 1972, the Steffie Doll face was used for PJ. Here are the other P.J.'s made through 1983.
The only Barbie case that I am aware of that includes PJ is a Barbie & P.J. Sleep & Keep case. It is very hard to find.
Here are the current listings: