In an interview in The New York Times a few years ago, Rick Owens memorably said “Right now I’m trying to figure out how to make tulle look like concrete.” That oxymoronic goal seems to be shared by several designers this season, who give tulle (and its playful cousin, dotted Swiss) more structure with ruching, pleats or boxy cuts. Sometime tulle is used as a filmy outerlayer for sweatshirts or trousers or is cut into a simple tee, adding ballet-worthy illusion to daytime basics.