The closet fabric to the "Giana" that was used in the 70's would be Jet Set at Joanns fabric.
This particular Senator Gown is lined with the same material. There is no zipper in the ANH gown it is open slit with tie at the neckline. The hood is all one piece of material that is doubled and machine sewn around so that it has the floaty look to it. It is what is called a "Napkin hood"
There are NO I repeat NO back seams and no front seams only side seams in this gown. It is a true 'Ragland sleeve gown.'
I hope this helps.
R