This combo of a navy coat and black leather leggings makes for the ultimate cool-girl's casual style. Finishing off with black leather over the knee boots is an effortless way to introduce some extra flair to your look. During the winter months, when warmth is a must, it can be easy to surrender to a less-than-stylish outfit. However, this outfit is hard proof that you can actually stay cozy and remain equally stylish during the winter months.