Dayton Midi Dress in BlackThe Dayton Midi Dress in Black by Rebecca Vallance. The Dayton Midi Dress in Black from Rebecca Vallance is a versatile wardrobe staple, tailored from jacquard knit. Designed with a fitted silhouette, its turtle neckline enhances the flattering, body skimming shape, while short sleeves add a refined touch. The pencil midi skirt is detailed with a back split for ease of movement, and an invisible zip fastening at the back ensures effortless wear.