Putting together a waistcoat with grey vertical striped dress pants is an on-point idea for a smart and polished look. A pair of beige tassel loafers can immediately play down an all-too-perfect getup. So when spring is in full effect, you may find this outfit your favorite. As a gent in his 30s, you want to start dressing with more refinement. That's when combinations like this come in useful.