Delaying its fourth-quarter earnings report by two days, The Warnaco Group warned that its net loss for the year would be substantially greater than the 25 to 30 cents a share previously estimated. Release of the company’s 2000 results and outlook for 2001, originally scheduled for today, was postponed until Thursday. As reported, the company’s earlier projections were made last November, when it reported a third-quarter loss of 96.5 million, including $72.5 million in restructuring charges.