An olive long sleeve shirt and white chinos are an easy way to infuse subtle dapperness into your current casual rotation. To add a bit of classiness to this outfit, introduce a pair of loafers to the equation. So as you can see, it's extremely easy to look awesome and stay cozy when colder days are here, thanks to this outfit. This ensemble proves that dressing appropriately for your age and looking fashionable are not mutually exclusive things for a 20-something guy.