His role will be to "return our culture to one that is friendlier to the creative process," Liz Claiborne Chief Executive Officer William McComb said.
"Tim will be a spokesperson for the creative community, a champion of product innovation, integrity and exceptional price-value and a catalyst for the creation of the irresistible product our consumers want and deserve," McComb said.
Gunn said he "jumped at the chance to serve as a mentor, adviser and sounding board for the design and merchandising community within Liz Claiborne Inc."
The "Project Runway" reality show takes talented but unknown designers and gives them a series of challenges that tests their ability to design fashion-forward wear, under intense time pressures and restrictions on what they can use. Gunn earned a following on the show.
Gunn also hosts Bravo network's upcoming "Tim Gunn's Guide to Style."