This classy combo of a suit and a white and navy vertical striped dress shirt is a popular choice among the fashionable gents. Finish with dark purple boat shoes to upgrade your look. Come roasting hot sunny days you're looking for a look to keep you comfortable and sharp –– this ensemble is just the right one. As a 30-year-old, you want to start dressing sharper. If that's the case, ensembles like this are a tested option.