There are a number of legitimate gripes someone might have about Zack Snyder's version of Superman in Man of Steel and Batman v Superman: Dawn of Justice, but his costuming probably isn't one of them. Though it's not an exact replica of the comics character's original threads, which have themselves changed over the decades, Henry Cavill's physical appearance for the role isn't one of the DC Extended Universe's problems.
One of the most prominent distinctions of the new Kal-El costume is the fact that, like everything else about the modern take, it's much darker. Whereas the Superman of old donned cobalt blue body tights with bright red symbol trimming and cape, the new suit is somewhere in the deep denim family. The texture of its fabric, too, appears much rougher than the leotards of adaptations past, and that might also be another bit of subliminal paralleling, considering how consistently dogged he's been by society and peers during the DCEU pics so far. Cavill's costume also ditches the thick belt and outer britches featured in the drawings, and his Clark Kent disguise glasses are more modish than they used to be.
Otherwise, though, the shape and musculature of Cavill's Superman suit is incredibly similar to the fictional physique—even his cheekbones are virtually identical. Interestingly enough, Cavill's features most closely match what Superman looked like after his resurrection from the dead while wearing the silver and black suit, so the most faithful Superman yet might still be yet to come.