Best clothes for commuting in London

Hi All,
As the winter is coming, it's time to dress warmer outside. Usually I just wear a t-shirt and a long or short trousers. But these are not too warm and not waterproof at all. Usually by the end of my 8km road to work, I sweat a lot so would be good something breathing thing. Also looking for solution for rainy days, some waterproof clothes.
If you guys have any experience, recommendation, don't hold it back
As the winter is coming, it's time to dress warmer outside. Usually I just wear a t-shirt and a long or short trousers. But these are not too warm and not waterproof at all. Usually by the end of my 8km road to work, I sweat a lot so would be good something breathing thing. Also looking for solution for rainy days, some waterproof clothes.
If you guys have any experience, recommendation, don't hold it back

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If its peeing down you'd be better off in lycra and change at work. Forget waterproof trousers - you'll be as wet from sweat as you would rain.
Breathable waterproof fabrics are actually pretty easy to find these days - you can probably find half decent waterproofs without having to lie to your partner / children / self about how much you spent.