Make a white turtleneck and blue jeans your outfit choice to feel absolutely confident in yourself and look casually stylish. If you want to effortlessly step up this look with shoes, why not add tassel loafers to the equation? This look is most probably what you're looking for as a young guy.
A white turtleneck and beige chinos are amazing menswear staples that will integrate really well within your current off-duty collection. You could perhaps get a bit experimental on the shoe front and smarten up this outfit by slipping into tassel loafers. Think it's hard for 20-year-old gents to master semi-casual style? This combo is definitive proof of otherwise.