When it comes to casual refinement, this pairing of a puffer jacket and a grey turtleneck doesn't disappoint. And if you wish to easily tone down this outfit with one single item, introduce a pair of white leather low top sneakers to the equation. When you're having one of those dreary autumn days, sometimes only a knockout ensemble like this one can cheer it up. Interested in outfit ideas for 20-something guys? This ensemble is pretty inspiring.