A crew-neck t-shirt and navy skinny jeans are a great combination worth having in your day-to-day casual repertoire. Complement your ensemble with burgundy casual boots to completely shake up the outfit. Keep this outfit ready to go come spring, and we promise you'll save a ton of time racking your brain for what to wear on more than one morning. And if we're talking casualwear for 20-year-old men, this combo is perfect.