Sustainability plays such an integral role in Stella McCartney's designs, not only through her use of recycled materials and faux leathers, but in subtler ways as well. The pared-back silhouette of this turtleneck sweater, for example, is strategic in ensuring that it will remain a constant in your wardrobe for years to come. It has been knitted in Italy from soft wool and has a lightweight handle that's perfect for transitional weather.