A burgundy crew-neck sweater and navy ripped jeans are indispensable must-haves if you're figuring out an off-duty wardrobe that holds to the highest fashion standards. A pair of dark brown leather chelsea boots will put a different spin on an otherwise utilitarian look. Can you see how extremely easy it is to look seriously stylish and stay warm when colder days are here, all thanks to looks like this one? When it comes to casual fashion tips for 20-year-old guys, this combo is ideal.