Marry a grey denim jacket with grey skinny jeans if you're looking for an outfit option for when you want to look casually dapper. Complement this outfit with white leather low top sneakers and the whole look will come together. If it's one of those dreary autumn afternoons, what better to cheer it up than a on-trend getup like this one? Casual getups for 20-year-old guys aren't actually that hard, as you see here.