Pair a dark green field jacket with a navy crew-neck t-shirt to pull together an extra stylish and current off-duty outfit. We adore how cohesive this outfit looks when complemented with a pair of black and white canvas low top sneakers. Seeing as it is getting colder with each day, this look is a great choice for in between seasons. Guys who are curious how to pull off cool off-duty style in your thirties, this getup should answer your question.