A green dress shirt and dress pants are a sophisticated outfit that every sharp gent should have in his wardrobe. For something more on the casually cool end to finish off this ensemble, complete this look with dark brown leather derby shoes. You can bet this ensemble is the answer to all of your transeasonal style woes. As you slip into your 30s, you probably want to start dressing maturely. In this case, outfits like this are a solid bet.