In reply to JudePadfield:
Well, you don't really need expensive named brands for that. Any trousers that fit, with unrestricted movement (good cut or stretch fabric), and fairly narrow ankles (so you can see your feet) are all you really need.
Have a search on the forums; trousers are frequently discussed.
I'd go for a robust nylon, rather than cotton.
These are a pretty decent, lightweight, but fairly robust fabric, and currently only £20:
https://www.decathlon.co.uk/forclaz-500-womens-walking-trousers-grey-id_833...
Post edited at 00:15