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.
Wearing them under bump might just have to be the solution. Not sure yet how big bump is going to get, but DH's waterproof jacket is enourmous so I'm sure I can wear that (won't matter if he gets wet! ) to keep the bump dry.