Abundant decolletage is part of Elvira, Mistress of the Dark’s famous look. And the woman behind that iconic horror hostess persona, Cassandra Peterson, says Dolly Parton “has all the assets that you need” to portray Elvira. Cassandra Peterson, better known as Elvira, Mistress of the Dark, in 2021. Parton’s been inducted into the Country Music Hall of Fame, Songwriters Hall of Fame and, rightly or wrongly, Rock & Roll Hall Of Fame. Although there’s no Dolly biopic yet, the 79-year-old’s life is the subject of a new stage production, “Dolly: A True Original Musical.”