Silver Foil Detail Slip Midi Dress. As party season approaches, we all want to look good and feel great right? Check out this silver foil detail slip midi dress which is a new arrival at River Island. This stunning mid length dress comes with adjustable straps and daring cowl neckline. The tie waistline belt adds a little more intricacy to it’s overall stunning look. Add a pair of heels and you are ready to dazzle at any party this season