Vintage 70's Polyester Geometric Pattern Disco Button Down Shirt Light Grey

Vintage late 1970's, Womens, Union made, polyester button down shirt. Light Grey with a square patterm White and orange button (please note the top button at the neck is missing) I would say a size Medium please see measurements. Only tag is the Union tag at collar. In very good vintage condition. Sleeve length runs a bit short. Measurements are about- Length-25.5" Pit to pit- 18" Sleeve length- 28" from shoulder down is 22"