Teen retailer PacSun emerged from bankruptcy this week after closing only 20 of its 590 stores and reducing its rents at others. The PacSun store at Westfield Montgomery Mall has remained open throughout the process — as has the mall’s Aéropostale store, which has been in bankruptcy since May. But the mall did lose one teen retailer over the summer: Allure, which carried special-occasion dresses, closed its doors in August.