Teaming a navy waistcoat with grey dress pants is a good option for a sharp and sophisticated look. Round off this getup with dark brown leather tassel loafers to serve a little outfit-mixing magic. This outfit is a tested option if you're looking for a great, season-appropriate outfit. As you get into your 30s, you probably want to start dressing with more refinement. If that's the case, looks like this come in very useful.