Consider teaming a white and blue print crew-neck t-shirt with grey jeans to assemble an off-duty and absolutely dapper outfit. Add a pair of white canvas work boots to this look to bring a dash of stylish nonchalance to your outfit. With rising temperatures come warmer days and the need for a fresh getup just like this one. Casual ensembles for stylish 30-year-old gentlemen aren't actually that hard, as you can see.