If you use a more laid-back approach to dressing up, why not rock a blue denim shirt with white jeans? Black leather casual boots are guaranteed to inject an added touch of style into your ensemble. Keep this outfit ready to go when spring comes, and we promise you'll save a ton of time getting ready on more than one morning. Gents wondering how to pull off cool casual dressing as you pass the big 3-0, this combination should answer your question.