I started with army surplus trousers.
Decided I wanted something posher and not camo.
Spent a fortune, and was still going through 2 pairs every 6 months (barbed wire is not my friend).
Now back to surplus, and wondering why on earth I bothered. If you can find the newer issue trousers in MTP, they are superb. Dry in a flash, massive pockets, very comfy. If you're squeamish about cammo in public, make sure you have a plain top/jacket, and you just look like budget rambler, farm worker or gardener. Spend the money on a really good jacket and accept that trousers are just a consumable.