It isn’t every tag sale that sells Hermes, Prada, Bottega Veneta and Gucci scarves, Tori Burch and Nina Ricci sunglasses, Tiffany jewelry, Adrienne Vittadini and Miu Miu shoes, diamond necklaces, Ferragamo and Louis Vuitton handbags. Wadsworth Atheneum Museum of Art’s POSH Sale returns this year...