Flowers, leaves and winding vines pop like fireworks on a holiday across soft silky fabrics. Want black? You may also get white. The duo is a classic often shaped into modern blocks. The newest pants are wide and breezy and, along with miles of fringe, chunky platform shoes, sparkle, crochet looks and ragged denim, they trigger memories of a tumultuous 1970s. As surely as the Kansas City Royals’ opening day ushers in the new season, so do these fresh spring fashions.