To achieve a relaxed look with a twist, you can easily rock a raincoat and a grey long sleeve t-shirt. The whole look comes together perfectly when you introduce a pair of white and green canvas low top sneakers to your outfit. Keep this getup in your front hall closet when warmer days are here, and rest assured, you'll save time getting ready on more than one occasion. Gents who are curious how to sport cool casual outfits in your thirties, this outfit should answer your question.