If you take your style seriously, go for classic style in a white and blue vertical striped dress shirt and navy jeans. A pair of black suede loafers instantly ups the classy factor of your outfit. As a 30-something Millennial gent, you want to start dressing maturely. In this case, ensembles like this are perfect as inspiration.
Inject personality into your daily arsenal with a white and blue vertical striped dress shirt and navy chinos. Make a bit more effort now and introduce black suede loafers to the mix. Ideal to convey that you're mature enough and confident enough to hold your own in the outfit department.
Wear a white and blue vertical striped dress shirt with burgundy chinos to pull together a neat and classy ensemble. For something more on the sophisticated end to finish this getup, complement your look with a pair of black suede loafers. Looks like this help accept this next milestone that is your thirties with class and enthusiasm.