This combo of a dark brown blazer and a light blue dress shirt is a foolproof option when you need to look polished and incredibly sharp. Complement this look with a pair of brown suede oxford shoes for a sense of class. As you can see, it's very easy to look dapper and stay cozy when cooler weather hits, all thanks to ensembles like this. So if you're scouting for a stylish and age-appropriate getup for a 20-something man, this one fits the bill.