Teen retailer Pacific Sunwear, commonly known as PacSun, filed for Chapter 11 bankruptcy this week with plans to reorganize as a private company. PacSun, which has a store at Westfield Montgomery Mall, says it will operate as usual during the restructuring process and all locations will remain open. Gift cards and credits still will be honored for now, but it’s always a good idea to use them quickly in these situations. Teen retailers are having a hard time these days: American Apparel is also in Chapter 11, Abercrombie & Fitch is struggling, and Wet Seal, Delia’s and Deb Shops all have gone out of business.