Vintage blue floral midi dress

This dress has the prettiest details such as ties on the shoulders and a mermaid siloute. The pattern is SO beautiful and dreamy. Is a vintage size 12 which is equivalent to a modern size 8/M, but please go off of measurments for best estimate of fit. Measurments: Waist flat lay is approx 15 inches Pit to pit is 18 inches Pit to bottom (length) is approx 35 inches