Opt for a puffer jacket and blue jeans and you'll be the definition of manly refinement. A trendy pair of dark brown chelsea boots is the simplest way to add a little kick to the ensemble. If you're wondering how you should dress as a 30-something gent, this combo is a good source of inspiration.
Dark Brown Chelsea Boots with Puffer Jacket Warm Weather Outfits For Men In Their 30s
This getup with a puffer jacket and black ripped jeans isn't hard to achieve and is open to more experimentation. If you want to easily polish up this ensemble with one single item, why not introduce a pair of dark brown chelsea boots to the equation? This pairing should clear any doubts you had about dressing casually as a 30-something Millennial guy.