This winter I've not needed more than the Classic Softshell and a base layer - usually a short sleeve Rapha merino baselayer but once or twice I've worn a longsleeve Helly Hansen one. It's plenty warm enough for London winters. Although I do tend to 'run hot', as someone described it. It's breathable though, definitely a 'proper' riding jacket.
This winter I've not needed more than the Classic Softshell and a base layer - usually a short sleeve Rapha merino baselayer but once or twice I've worn a longsleeve Helly Hansen one. It's plenty warm enough for London winters. Although I do tend to 'run hot', as someone described it. It's breathable though, definitely a 'proper' riding jacket.