Flaunt that you know a thing or two about menswear by opting for a navy long sleeve shirt and a grey crew-neck t-shirt. Complement this look with a pair of tobacco leather work boots to easily turn up the cool of your outfit. During the colder months, when warmth is the priority, it can be easy to surrender to a less-than-stylish outfit in the name of functionality. This outfit, however, is a bright example that you totally can stay snug and remain equally stylish during the colder months. And if we're talking casual style tips for guys in their 30s, this getup looks good on almost any man.