late 1960s tissue silk hand dyed art caftan

the most stunning tissue silk dream dress with massive billowy sleeves and the most gorgeous colors. looks like it belongs on the French riviera on Anita Pallenberg.

label: none- looks to be a couture custom piece- stunning hand-finished seams. honestly looks like a Halston to me but there aren't any labels.
tag size (vintage): none remains
material: fine luxe tissue silk
length: 57-58"
chest: loose/free
waist: loose/free
as is: nothing to note. possibly pin holes or marks i missed