Casual apparel designer and retailer Guess? Inc on Thursday reported a 4.5 per cent slide in March same-store due to the Easter holiday shift and said same-store sales for the first quarter slipped 1.7 per cent. The California-based company said total sales for the four weeks to March 29 climbed 3.1 per cent to $29.2m from $28.3m in the year-ago period while total sales for the quarter rose 5.9 per cent to $83.7m from $79m.