Specialty fashion retailer The Wet Seal Inc on Thursday announced it swung to a fourth quarter loss on the back of weak holiday sales and a steep plunge in same-store sales. The California-based retailer of 610 stores under banners such as Arden B and Zutopia reported a net loss of 19 cents a share for the quarter ended February 1 compared to net earnings of 49 cents a share in the year-ago period.