Navy blue gauzy material with pants underneath

Skirt with pants underneath it. Lightweight gauzy material. Comfortable navy blue. Not sure of size. I found it in my one closet. When I put it on it fit me and I can wear between large to xxl. Measures 20” across and waist is elastic with a lot of give. This item is not dressy but a good run around comfortable item. Material is see thru but with pants its no problem. Not worn and in great condition in a smoke free home.