Do such things exist?
Or should I just buy some extra large mens trousers?
I'm really concerned with getting wet on the way to the station. I suppose I could start to carry a spare pair of trousers with me in case there's a downpour, but I'd rather just slip a pair of waterproof trousers and a jacket on if it's raining when I leave the house, rather than spend the 30 minute walk getting cold and wet.