The Elaine Kim Damara ruffle vest ($295) in seaweed and cotton poplin, is a dramatic piece that can be worn as a sleeveless jacket or as a cowl-neck top with the side pinned. Also great belted.
From Topshop this khaki sleeveless watefall vest ($90) has drapey side pockets in addition to the waterfall neckline.
silk waterfall jacket ($198) has almost a tribal feel with the nubby texture and pattern of the fabric. Would look great for work or dressed down as it is here.