I thought it might be Lot 78, or even one of Armani's collections, but I'm having trouble with those zipper pulls. Definitely feels designer. I'd run through all trendy designers. Dolce & Gabbana, Lanvin, Balenciaga, Maison Martin Margiela, Gucci, Paul Smith, Oliver Spencer, even Dunhill. Look through SSENSE, Mr. Porter and the like. Might find some tell tale details that'll lead you in the right direction.