Classic Vintage starts a century ago with the high-waisted tunics and hobble skirts of World War I, followed by ’20s Flapper styles. These look decidedly costumey today (as per Downton Abbey and Boardwalk Empire). More wearable are the sinuous bias cuts of the ’30s, the austere masculine-feminine ’40s styles, and the Mod ’50s and early ’60s, replete with fit-and-flare shirtwaists and slinky cocktail dresses. All these decades offer assured feminine styles, virtuoso workmanship, lush fabrics, and an elegance too often missing from more recent fashion. Customers tend to be devotees of all ages, but they skew midlife and older, according to most dealers. “These are women with confidence in their style, says Jennifer McCulloch, owner of Olive’s Very Vintage in Brooklyn. But beware: Classic Vintage is cut small, though large sizes can be found.