Lululemon Athletica said it is implausible to believe it intended to sell hundreds of thousands of nearly sheer yoga pants and hope consumers wouldn't notice, and that a securities fraud lawsuit claiming it did just that should be thrown out.

In a Wednesday night filing in the U.S. District Court in Manhattan, Lululemon and Chief Executive Christine Day said the company "disclosed in real time'' its efforts to recall and fix women's black yoga pants containing luon fabric, after learning that the pants suffered from sheerness when wearers bent over.