>>3393777Just about everywhere: H&M, Zara, All Saints, Topman, and the fast fashion places.
Then you could always look at the higher-end brands that work pretty exclusively in this sort of look like Rick Owens, Kris Van Assche, Julius, etc. A number of contemporary brands have begun edging in on that market by producing slightly watered down versions of those looks at a slightly lower price point, like T by Alexander Wang, Silent by Damir Doma, and Robert Geller Seconds.