If you're scouting for an edgy and at the same time sharp getup, choose a grey long sleeve t-shirt and skinny jeans. If you wish to immediately smarten up this outfit with a pair of shoes, why not complete your look with dark brown suede desert boots? As days are getting cooler, you'll discover that an ensemble like this is ideal for fall. And if we're talking casual fashion tips for 20-something men, this combination is perfect.