The shirt-jacket or 'shacket has been gaining traction over the last few seasons, and for good reason – the transeasonal piece is a wardrobe workhorse, fusing the casual nature of the shirt with the layering potential of outerwear. The Milford design by Oliver Spencer is a particularly versatile choice, showcasing a breathable linen fabric in an easy-to-pair hue. Linen/Flax.