OK so I have this £7.99 waterproof jacket..
I got it from Decathlon and it folds up into a small pouch. I keep it in my bag along with some overtrousers in case it rains because my windcheater isn't waterproof. It doesn't have any open seams for breathability yet claims it is brathable fabric. When I commute home I just wear the cotton short sleeve shirt I wear at the office as it will go in the wash when I get home. The thing is - when I get home and peel the jacket off I am absolutely drenched to the bone underneath it. Can this just be from sweat? It really is like wearing a bin-bag. I really don't want to have to bother with wearing some sort of long sleeve jumper to form a barrier between my sweat and the jacket, and would rather get a better waterproof yet lightweight jacket that maybe has some sort of lining that is more condusive to the distrbution of moisture on the inside. Can anyone make any suggestions? £20 is the most I want to pay.