This modern casual pairing of a charcoal blazer and navy ripped skinny jeans is very easy to throw together without a second thought, helping you look amazing and prepared for anything without spending a ton of time rummaging through your closet. With shoes, go for something on the more elegant end of the spectrum and round off your getup with a pair of white leather low top sneakers. This combo is also ideal if you're scouting for hot weather wear to get through a slow day. Those who wonder how to wear cool casual style as you mature into your 30s, you have your answer.