There’s a saying that more isn’t always better, but we’re guessing whoever coined it never got around to wearing a double breasted topcoat. Because of its construction (there’s an extra bit of material involved in the closure of this style) the double breasted coat provides an extra layer of defense against chilly winter winds.
Beyond that, this winter coat variant is quick way to instantly upgrade your style, as its shape is just inherently more stylish and sophisticated than other coats. Follow the same rules that you would for wearing a normal topcoat (don’t go too oversized, make sure the shoulder looks square on your frame before you commit, and find one that hits above your knees) and get ready to feel like a style superhero.