A raincoat and skinny jeans are both versatile menswear essentials that will integrate really well within your day-to-day arsenal. Let your sartorial chops truly shine by rounding off your outfit with a pair of white canvas high top sneakers. As you can see here, it's extremely easy to look on-trend and stay warm when cooler weather arrives, all thanks to combos like this one. This combo should clear any doubts you had about wearing casual clothes as a 30-year-old guy.