Vintage 1960s ~ Beautiful floor length nightgown or nightdress of silky nylon

Lovely soft Grecian white nightgown with a slender tie in the front or back. The tag is illegible but I provided photos anyway. No noticeable flaws, the fabric is light and soft. I am 5'3 and it reaches just above the floor. I had intended to wear it for Halloween as a hammer horror vampire but I fell ill (*_*)