This casual combo of a navy crew-neck t-shirt and white jeans is perfect when you need to look cool in a flash. Let your sartorial savvy really shine by finishing this ensemble with a pair of brown canvas low top sneakers. As the weather gets warmer, it's time to shed those bulky winter layers and choose an ensemble that's lighter, like this one here. Those who are curious how to wear modern off-duty looks well into your 30s, this combination should answer your question.