Dolly Parton's vintage stage dress from 1980s

Hello Dolly-fans,
My late father was a huge Dolly Parton 粉丝 :) after he past away he left us with a stage costume, a fragile vintage dress with long bat sleeves. The story is that he bought the dress at an Elvis Presley auction early 1980s. He paid a lot of money for the dress at that time. Unfortunately there is nothing backing up the authenticity of the dress. What do 你 think? The signed 照片 is authentic - but picture not in good shape.
Appreciate any feed back 或者 评论 你 might have.
Best regards
Christian