Clothing retail group Reitmans (Canada) Ltd on Wednesday posted a 20 per cent slide in first quarter earnings to C$4.1 million from C$5.1m in the year-ago period. The Montreal-based operator of 830 stores said sales for the quarter ended May 3 jumped 41 per cent to C$177.7m from C$126m last year due to its acquisition of Shirmax Fashions, although same-store sales slipped three per cent.