A blue suit and a navy crew-neck t-shirt are absolute essentials if you're putting together a smart closet that holds to the highest menswear standards. If you need to easily tone down your getup with a pair of shoes, complement your getup with athletic shoes. Seeing as the weather is getting colder every day, this getup is a wonderful choice for the season. And if we're talking casual style tips for 20-year-old gentlemen, this outfit looks good on almost anyone.