In reply to Alex Riley:
I’m unclear if it’s the Alpkit jeans you’ve trashed. My pair are going strong, but I’ve not had them for ages. Six months or so. They’ve lasted much better than Simond jeans I’ve had previously. Decathlon clothing is often a false economy in my view, as the fabrics normally wear out/loose their shape much quicker than more expensive brands.
Levi Jeans last really well in my experience. I’ve got some 514s which are a good cut for climbing, if you’ve got big legs.
Mountain Equipment Hope pants are good tough, canvas style trousers for climbing in.
Disclaimer - I work with Alpkit, but wouldn’t recommend the jeans if I didn’t think they were good.