Streetwear deals in easygoing nonchalance, and there are few silhouettes that embody this energy as much as these Balenciaga sweatpants. Theyre rendered in heavyweight jersey with a relaxed, wide-leg fit, but its the trompe-l'oeil detail to the waistband that captures this attitude most - note how a flash of tartan poplin gives the impression of Balenciaga boxer shorts layered underneath.