How would you style this satin jumpsuit for a wedding guest?

it really doesn't need much. depending on the colour scheme of the wedding, you could add a sash or high waist cloth belt, if there's no specific coulour, white does well. hair is not tricky, too. if hair is long, i would wear it side-parted and open on the left shoulder to acccentuate the free shoulder right. some big golden oreole earrings would probably look stunning with the simple black. then you could always consider a matching gold chain necklace, not too long though. hope this helps