Liz Gross, longtime proprietress of Xtabay Vintage, doesn’t mind riding the Mad Men trend—in fact, at Saturday’s annual Xtabay Holiday Fashion Show, she plans to trot out several hot little 50’s and early 60’s numbers. "This year, I’m looking for less funk, more elegance, than ever," she says. "And not just the dresses; hat, coat, shoes, jewelr...