This pairing of an olive parka and a white crew-neck t-shirt is definitive proof that a simple casual look can still look truly stylish. For something more on the dressier side to round off this look, add navy and white canvas low top sneakers to the equation. Can you see how very easy it is to look on-trend and stay comfy when cooler weather hits, all thanks to looks like this one? This combo demonstrates how 20-year-olds slay in the style department.