A brown cardigan and white jeans worn together are a nice match. And if you want to instantly step up your look with a pair of shoes, why not introduce dark brown suede chelsea boots to the equation? Keep this look ready to go come warmer days, and we guarantee you'll save time getting dressed on more than one morning. As a 30-something Millennial gentleman, you probably want to start dressing like an adult man. In this case, looks like this are a never-failing option.