Patternmaking is in Katie Ermilio's blood. A granddaughter of Grace Kelly's personal clothier, Ermilio grew up in her father's bespoke menswear atelier, and continued down a similarly elegant path with a ready-to-wear line of her own focused on ultra-feminine eveningwear. Over the past several years, Ermilio has earned a following for charming cocktail frocks, which have been worn by such stars as Michelle Williams, Mickey Sumner, and Nora Zehetner, the latter of whom appears in the designer's Spring video. In the short clip, Zehetner stirs up trouble in Williamsburg, Brooklyn, skipping across sidewalks, playing on bike rails, and even painting a dashing muralist with the hand-drawn blue rose print that appears on silk taffeta pieces in the new collection. In general, Ermilio makes the kind of clothes you could picture a grown-up Eloise wearing around the Plaza: petal-pink silk faille tea dresses with sweet bow details and full crinoline skirts, swingy box-pleated strapless gowns, and a range of options for sophisticated bridesmaids. Special-occasion dresses are Ermilio's niche, but there were plenty of daytime wares here, too, including tailored shorts, miniskirts, crop tops, and a short-sleeve fur chubby that kept things from feeling too saccharine.