This is hard proof that a blue waistcoat and navy dress pants look amazing when worn together in a refined look for a modern dandy. As for the shoes, stick to the casual route with a pair of brogues. As you're progressing through your late 20s, you want to start dressing in a more elegant manner. In this case, looks like this are a goofproof option.
Blue Waistcoat with Brogues Outfits In Their 20s
This classy pairing of a blue waistcoat and navy dress pants will cement your outfit coordination expertise. To give your ensemble a more relaxed aesthetic, add a pair of brogues to the equation. Wear this ensemble if you need to project a more refined image as a young gentleman.