We're all looking for functionality when it comes to styling, and this casual street style combination of a dark green parka and black skinny jeans is a perfect example of that. Opt for beige suede chelsea boots to make the ensemble slightly sleeker. As you can see here, this ensemble is a really savvy idea, especially for in-between weather, when the temperature is dipping. If you often wonder how to dress as a guy in his twenties, this outfit is a great example.