The tea gown, a loose garment for swanning around in the afternoon, appeared on the Parisian runways this March. Its length and sweep give it a nostalgic edge that inspires interesting variations. Dressier than a robe, it feels just right for staying in or sashaying out. Thanks to Jane’s Vanity, I own two such gowns: one for cool weather, one for warm. So handy. A necessary luxury.