For a fail-safe smart casual option, you can rely on this combination of a dark brown shearling jacket and a navy turtleneck. If you don't want to go all out formal, throw in black leather work boots.
Navy Turtleneck with Dark Brown Shearling Jacket Cold Weather Outfits For Men
If the setting calls for a polished yet knockout menswear style, pair a dark brown shearling jacket with a navy turtleneck. Brown leather casual boots are a great idea to finish this look.