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Choose a long, heavy overcoat for cold weather and bundle up. The primary purpose of an overcoat is to act as a warm outer layer. For this end, materials like wool, cashmere, and fleece will work best. Look for thick fabrics, strong seams and additional features like belts, buttons and high collars you can use to envelope yourself when it gets brisk.  Overcoats pair well with hats, gloves, scarves and other formal cold weather gear.  Nicer types like Chesterfields and Polos are ideal for wearing over a suit, which can be difficult to layer effectively in the winter. Another function of overcoats is to create a barrier between you and the outside world. They provide enough coverage to cut down on wind chill, are sturdy enough to protect you from moisture and everyday contact, and act as a membrane to keep your formal items from getting dirty. An overcoat can lend you peace of mind knowing that you and your clothing will remain protected and pristine beneath it.  If you think your lifestyle might be rough on an overcoat, try out materials like cotton twill, waxed canvas or even leather. These tough fabrics are resistant to wear and tear and are generally easy to clean. Safeguard leather overcoats with a protective coating of oil to make them water-resistant. Go for an overcoat over a fleece jacket or windbreaker the next time you need to make a good impression. Overcoats are one kind of formal garment that never goes out of style. You’ll look much more suave wearing a well-fitted, sensible overcoat than you would in plain outerwear, or caught unprepared for chilly weather in only a suit.  Black, charcoal gray and navy blue should be your go-to color choices for formal dress.  An overcoat can and should be worn in place of inappropriately casual jackets whenever possible. While overcoats have become a less prevalent fashion choice in contemporary times, they are still regarded as the peak of men’s business and formal style. You’ll stand out from the crowd and be taken seriously as a man of refinement once you add a nice overcoat to your coat rack. It’s a good way to inject some classic style into your wardrobe, and you’re sure to turn heads when you walk past a crowd of people all wearing the same thing. Go for modern styles and materials and an accentuated fit. Overcoats are marked by a somewhat vintage aesthetic and can look like a novelty if they’re not chosen carefully.

Summary:
Add an extra layer for the cold. Protect yourself from the elements. Achieve a more formal look. Stand out.