Somebody has been selling a lot of tunics. Tory Burch just closed on her $16 million deal to buy the late Howard Gittis’ mansion on Ox Pasture Lane in Southampton, reports The Post’s Jennifer Gould Keil. The house comes with six acres. An unnamed neighbor is buying the rest — 7.4 vacant acres for an additional $16.5 million, bringing the total deal to $32.5 million. Together, it’s the biggest Southampton sale since the economic downturn and especially noteworthy since it’s on a fancy street in the tree-lined “estate section” — but not on the ocean. Corcoran’s Tim Davis had the listing.