This is a beautiful piece from the 60's. Made of a very silky fabric that could be a polyester/nylon blend but I can't be certain. The colors are rich and bold. Banded collar neckline with large sexy cut out in the center of the chest. Empire waist with black cotton trim that ties at the back. Center back zipper. Full body. Fully lined. Pristine condition! Best fit would be a Medium, however, please see the measurements below for a proper fit.
Measurements

Armpit-armpit doubled 38"
Empire waist 36"
Hip 64"
Length from nape of neck to hem 36"

This item is sold from an excellent, highly rated vintage boutique in Westfield, Massachusetts.