We love how this smart casual combination of a navy crew-neck sweater and blue dress pants instantly makes you look stylish. If you want to effortlessly tone down this outfit with a pair of shoes, why not introduce a pair of brown leather brogue boots to the mix? During the colder months, when comfort is crucial, it can be easy to surrender to a less-than-stylish outfit in the name of convenience. But this outfit is a vivid example that you can actually stay warm and remain equally stylish in the colder months. Surely a common option when it comes to outfit ideas for 30-something gents.