If the setting allows casual style, you can rely on a white v-neck t-shirt and white seersucker shorts. Avoid looking too casual by rounding off with a pair of driving shoes. All in all, a good example of laid-back style for 30-year-old gentlemen.
White V-neck T-shirt with Driving Shoes Casual Warm Weather Outfits For Men In Their 30s
Such items as a white v-neck t-shirt and navy jeans are an easy way to introduce toned down dapperness into your daily casual wardrobe. Driving shoes will add an elegant twist to your getup. A safe bet ensemble appropriate for 30-something Millennial gents who prefer casual clothing.