Bolster your casual roster with <a href="http://www.mrporter.com/mens/Designers/JCrew">J.Crew</a>'s 'Broken-In' T-shirt. Rendered in a handsome brick hue the label aptly calls 'Chimney', this wardrobe mainstay is made from lightweight cotton-jersey that's been specially treated for softness. Wear it with shorts and sneakers at the gym, switching to dark jeans at the weekend.