Lovely vintage dress from the 1960s / possibly late 1950s?

With big pointy collars, double front button detail, in a synthetic fabric with a nice sheen on it

In an aqua green/ blue colour with atomic / psychedelic pattern

I’d estimate a 16-8 fit but please check the following approximate measurements against your own, and using the size chart included in the photos

Across shoulders - 16.5 inches / 42cm

Pit to pit - 21.5 inches / 54cm

(Up to 43” bust)

Across waist - 20.5 inches / 52 cm

(Up to 41” waistline)

Length - 39 inches / 99 cm