For a look that's super straightforward but can be smartened up or dressed down in many different ways, consider teaming a white crew-neck t-shirt with black dress pants. Puzzled as to how to finish off? Introduce a pair of white low top sneakers to the equation for a more laid-back aesthetic. Embracing the cold is very easy with such ensembles as your style inspiration. No doubt, a popular option when it comes to dressing ideas for 20-something men.