Benjamin Channing Clyburn and Sonia Yoon are no strangers to the ladified look. But this go-around, the designers took aim at a more December, less May sort of dame: a Connecticut grandmother and her closet. The translation? Models sporting old-biddy buns, the occasional quaint vintage hat and clothes that evoked a bygone magpie feel. Plaids and haberdashery tweeds were everywhere — “We wanted fabrics that looked old,” said Yoon, preshow — on nipped-waist jackets, robe-like coats, shorts and ruffled pencil skirts. Ruffles, in fact, played a major role in the dressier cocktail portion, perhaps too repetitively, as did “mumsy” florals. And while the end result was plenty uptown posh, it left one yearning for a counterpoint of Bensoni spunk.