Blue/cream polka dot vintage drop waist dress

Measurements: Bust 19.5 inches Waist 16.5 inches Length 43.5 inches Background story: I remember my grandma buying this dress at a consignment/vintage store in 1996. She gave it to me when I got older, but it has never fit me. It doesn’t have any tags to tell me what brand it is or what material it’s made of. So I apologize for the lack of information. I want it to go to someone who will love it!