CD Projekt Red's Community Lead Marcin Momot has advised against downloading the new DLC that is available on the Xbox Live and the PlayStation Store for The Witcher 3: Wild Hunt. The DLC, listed as a new outfit for Ciri (the Zerrikanian outfit), "wasn't ready" for release, according to Momot.
Since the game's release CD Projekt Red has been releasing DLC weekly as part of their ongoing support for the Witcher 3, but this week they revealed that they would not be releasing any DLC because of an upcoming patch.
"We hope you understand our decision. We’ve gathered so much feedback from you over the past couple of weeks and we want to implement as much of it as possible," said Momot in the patch announcement.
If you have gone ahead and downloaded the DLC, it "would be best to uninstall it" as it did not officially release and has the chance to compromise your game.