Offering a versatile and stylish layer to any outfit, Barbour's men's overshirts add a unique element to your everyday look. Ideal for being worn as an extra layer in the winter and as a lightweight jacket in the summer, men's overshirts are great for transitioning seasons.. Overshirts are a staple outerwear choice available in a wide range of styles and colours, from natural earth tones to bright hues and signature Barbour tartan.