For an effortlessly sophisticated outfit, rock a white crew-neck t-shirt with brown dress pants — these items fit well together. And if you wish to easily up the style ante of this look with one single piece, why not complete your outfit with a pair of black leather brogues? This ensemble is a wonderful option when it comes to putting together a standout outfit for weird transition weather. As a 30-something, you probably want to start dressing maturely. If that's the case, ensembles like this are a foolproof option.