This classic and casual pairing of a navy sweater vest and light blue jeans is super easy to pull together without a second thought, helping you look on-trend and prepared for anything without spending a ton of time rummaging through your closet. Finish this outfit with white and red leather low top sneakers to serve a little mix-and-match magic. As the weather warms up, it's time to get rid of those bulky winter clothes and choose something lighter, like this ensemble here. Rock this getup to assemble a more mature look as a 30-something Millennial guy.