Casual apparel retailer Pacific Sunwear of California Inc said sales at stores open at least a year crept up 0.4 per cent in January. The company, known as PacSun, said it expects to report earnings of 41 cents a share for the fourth quarter ended 2 February. Chairman and chief executive Greg Weaver said merchandise margins for the month and the quarter "held up well and were similar" to the year-earlier quarter.