This casual combo of a navy blazer and blue jeans is capable of taking on different forms according to the way it's styled. Dial down the formality of this outfit by rounding off with a pair of white leather low top sneakers. As you can see, it's super easy to look amazing and stay comfortable when chillier weather comes, all thanks to ensembles like this one. A no-brainer combination appropriate for 20-something gents who like casual clothing.