A tan sweater vest and charcoal wool dress pants are certainly worth being on your list of true menswear staples. In the footwear department, go for something on the relaxed end of the spectrum and complement your ensemble with a pair of white athletic shoes. We love how great this one is for transeasonal weather. As a man in his 30s, you probably want to start dressing more professionally. In this case, looks like this are perfect as inspiration.