"She changes 12 times a day; it's insane," the designer-stylist told the publication, adding that though he's loosening his reigns on work with Gaga, he'll always be there to support her.
"She's going to be my BFF forever, but my ex-assistant Brandon [Maxwell] is heading that project," he said. "I'm too busy with [other commitments]. I've done two albums with her, it's been like five years, and you know, I'm always going to be involved somehow, but I cannot do it every day."
Formichetti, who was the creative genius behind several of Gaga's most memorable looks -- including the meat dress she wore to the 2010 MTV Video Music Awards -- is instead focusing his attention on his responsibilities to Uniqlo and Diesel. The 36-year-old was recently named the artistic director for the latter label.
"I live between Europe, America and Asia," he continued. "I've terminated my other jobs to concentrate on Uniqlo, and … I still have time to do lots of other things."
Gaga's upcoming album, ARTPOP, is being billed as a multimedia "project," not just a musical collection, the singer told WWD in a recent profile.
"The point [of ARTPOP] is that art and pop can have an exchange," she said. "[I'm not] defined by the same designer or defined by the same hair cut or defined by the same icon. The statement is that I'm not one icon. I'm every icon."
"I'm an icon that is made out of all the colors on the palette at every time," she added. "I have no restrictions. No restrictions."