You'll be surprised at how easy it is to get dressed like this. Just a navy waistcoat matched with navy chinos. As for the shoes, you can stick to the casual route with navy athletic shoes. So if you need style inspiration for dressing in your 30s, this getup is definitely worth saving for later.
Marrying a navy waistcoat with brown chinos is a smart option for a smart and sophisticated getup. For something more on the daring side to round off this look, add a pair of navy athletic shoes to the equation. If you're frequently worried about dressing maturely, this getup is a safe option.