For a semi-casual menswear style, team a navy vertical striped suit with a dark green turtleneck — these items go really good together. If you want to immediately rev up this ensemble with a pair of shoes, why not complement your ensemble with a pair of dark green leather double monks? This getup is the definition of perfect for when leaves change color and fall is at its best. Wear this to create a more conservative look as a 30-something Millennial gent.