You'll be amazed at how easy it is for any guy to pull together this effortlessly neat look. Just a navy sweater vest married with a light blue long sleeve shirt. For a more relaxed aesthetic, why not add tan athletic shoes to the equation? When spring is here, you'll love this getup as your go-to for winter-to-spring weather. Interested in outfit ideas for 20-year-old guys? This combo is worth saving to your inspiration folder.