Men's Patagonia Alpine Guide Pants, black
Price: £75 including postage (tracked)
Size 30 (so will fit Small/XS, I think technically size 30 is XS but American XS...!). I am a skinny 182cm/5'11" and find them slightly too short in the leg but fine round the waist. I am size Small or Medium in most other brands.
2011-2012 vintage, they have been used once or twice for nothing much so are in decent condition, one small crampon nick on the inside lower right leg next to the seam which could be patched or sewn over easily and would be covered by gaiters.
They have the same pocket/feature configuration as described in the below reviews/sites, so:
2 hip pockets, 2 leg pockets, 1 back pocket and adjustable elasticated gaiter cuffs. It's probably worth reapplying DWR before you take them out as they do not have sealed seams or a membrane.