This classic and casual pairing of a black crew-neck t-shirt and blue dress pants is super easy to throw together in no time flat, helping you look sharp and prepared for anything without spending too much time going through your wardrobe. White leather loafers are a guaranteed way to infuse an added dose of style into this ensemble. And if you're hunting for a neat look that will take you from winter to spring, this one is great. No doubt, a fail-safe option when it comes to dressing ideas for 20-year-old gentlemen.