Marry a yellow overcoat with a sweatshirt to assemble a sleek and sophisticated look. A great pair of black leather slip-on sneakers is the most effective way to give a dose of stylish casualness to this outfit. So if you're on the lookout for an ensemble that's on-trend but also feels totally season-appropriate, this is it. Sartorial inspiration like this will help you stay incredibly fashionable as you progress through your 20s.