come on. I admit I've got a pair of zippy trousers hidden in my wardrobe (acquired not bought, mind). I've seen enough people in them. They are de rigeur for striding across soggy moorland surely.
Somebody else must have some? Own up!

and I never go anywhere without a notepad just in case I have an Important Thought. However using pencil works just as well as fancy stuff on waterproof paper (unless it's absolutely pouring).