A blue denim shirt and a long sleeve t-shirt are a combination that every trendsetting gent should have in his menswear collection. Finishing with a pair of brown leather cowboy boots is a guaranteed way to infuse an air of stylish effortlessness into your look. As you can see, this combination is a really wonderful choice, especially for unpredictable fall weather, when the temperatures are getting lower. Perfect to portray that even as a 20-year-old man you're confident enough to own your fashion choices.