The Mego corporation made the Dinah-Mite doll to compete with Mattel's Barbie from 1972 to 1975. Dinah's advertising featured her as an incredibly poseable doll who "sits and stands"; An overt shot at Barbie, who famously cannot "stand on her own".
Dinah-Mite came dressed in basic outfit & other accessories were sold separately.
Dinah Mite commercial:
More Dinah-Mite at the megomuseum
What's it worth? Take a look at this Dinah Mite price guide: sold listings for a value indication.