Man cannot survive on blue jeans alone. And on days when you feel like something different or a little less casual, a pair of black denim dungarees offers up a relaxed refinement which makes for a cool alternative to flannel trousers. Look for simple, straight-leg styles with a dark wash and little to no embellishments. Of course, they can at times look a bit extreme, so make sure to pair yours with light-colored neutrals on top.