No brand name beautiful high slit dress or cover

This is a beautiful piece with lots of versatility. I styled it with sneakers, a bucket hat, and a bowling bag to dress it down for an everyday sexy look but it could easily be dressed up, be worn over jeans, leggings, or wide leg trousers. Could also be a lux bathing suit cover. There are no tags and no sizes but I am a size 8/10 and 5'7" and it's long on me with a slit to the hip, the shoulders are slouchy but for someone bigger it would hug the curves and still be just as slinky.