This outfit with a grey zip sweater and a white polo isn't a hard one to score and leaves room to more experimentation. Complement your outfit with a pair of white low top sneakers et voila, the ensemble is complete. As you can see here, it's very easy to look stylish and stay warm when chillier days are here, thanks to this getup. As a 30-year-old gentleman, you want to start dressing more professionally. If that's the case, inspiration like this comes in very handy.