This combo of a beige puffer jacket and a crew-neck sweater is a winning option when you need to look effortlessly sleek in a flash. Let your styling sensibilities truly shine by finishing your ensemble with black leather chelsea boots. Can you see how very easy it is to look dapper and stay comfortable when cooler weather arrives, thanks to this outfit? Those wondering how to rock smart casual style as you progress through your 20s, this combination should answer your question.