Stunning vintage designer silky scarf dress open back hood option

Stunning vintage 60s/70s designer silky scarf dress open back or possibly pin scarf portion up for a hooded look? Modest yet sexy perfect for wedding or summer event. Blue teal pink purple floral pattern, no material content or size tag, possibly silk? Material is somewhat sheer would possibly need slip. Fits in the size 5/6 range would be my guess but refer to measurements. Flat lay Pit to pit: 19” Waist: 16” Hip: 19.5” Length: 43” Sleeve length : from armpit 17.75” H021