Bigger retail could be coming to the District’s downtown area adding to the robust resurgence in shopping along some of the central city’s main corridors. With Seventh and H streets the new epicenter for downtown shopping (the newly opened Benetton, Urban Outfitters, Ann Taylor Loft, et al) and Hechts and H&M over toward Metro Center, the Post took a look at the status of the rebirth of downtown Washington’s shopping. Some critics might say that…