This smart casual combination of a camel duffle coat and a white turtleneck is very easy to throw together in next to no time, helping you look sharp and ready for anything without spending a ton of time searching through your wardrobe. If you need to immediately perk up this outfit with footwear, add a pair of navy leather loafers to your outfit. As you can guess, this is a knockout pick come warmer weather. As a 30-year-old gent, you probably want to start dressing more professionally. In this case, combinations like this are a winning option.