A reliable woollen coat in the winter is brilliant, but you'll thank yourself for having a lighter option to layer during the warmer months. Ideally, a woman should have two coats, one for winter and autumn and another for spring and summer. However, nothing says a woman can't have a stylish outer layer every season. Especially the fashion-conscious woman, sporting trench coats in summer, woollen coats in winter, wrap coats in autumn and mid-length coat in early spring.