Leading women's apparel and lingerie group La Senza Corp on Friday revealed it swung to a first quarter loss amid higher expenses and a difficult trading environment. The Montreal-based operator of more than 400 stores under banners such as La Senza and Silk & Satin, reported a loss of C$3.8 million for the quarter ended May 3 versus a profit of C$48,000 in the year-ago period.