Pair a sweatshirt with navy shorts for an everyday ensemble that's full of charm and personality. For something more on the daring side to complete this ensemble, introduce white and black high top sneakers to the equation. So if it's a baking hot warm weather afternoon and you want to look dapper without putting too much effort, this look will do the job in no time flat. When it comes to casual dressing ideas for 20-something gentlemen, this look is perfect.