This laid-back pairing of a white sweatshirt and a crew-neck t-shirt is a winning option when you need to look casually cool in a flash. Bump up this outfit by slipping into black leather brogue boots. So if you're scouting for an ensemble that's sharp but also feels entirely spring-appropriate, this just might be it. This pairing illustrates that as a 20-something gentleman, you have a wide array of styling options.