For rugged sophistication with a modernized spin, consider pairing a grey waistcoat with a dress shirt. As a 30-something Millennial gent, you want to start dressing more maturely. In this case, combos like this are ideal as inspo.
Grey Waistcoat with Dress Shirt Dressy Chill Weather Outfits In Their 30s
No doubt, you'll look extra sharp in a grey waistcoat and a dress shirt. As you head into your 30s, you probably want to start dressing with more refinement. In this case, ensembles like this are a safe option.
When it comes to timeless polish, this combination of a grey waistcoat and a dress shirt doesn't disappoint. This one is a nice yet mature ensemble for an over-30 gentleman.