/ Fiber pile trousers
Buffalo is your fibre pile/pertex friend.
Couple of links below to specific trousers
http://www.silvermans.co.uk at £80
Cotswolds have them at £93
Needle sports, great shop, have the Techlite version at £60.
All of the above have a pertex outer for windproofing which solves the original weakness of fibre pile clothing.
I sold the thicker salopettes. Great for winter belays but just too warm for anything else. Can't help if you just want fibre pile without the outer pertex. Sorry.
Not suprisingly from a sailing gear company like Musto http://www.musto.com/fcp/categorylist/dept/sailing_middle_layer
Couldn't see any pile items at Musto.
Try looking for Helly Hansen Workwear, which still uses pile, even if their outdoor range does not... Also cheap, e.g. Bern or Thun trousers:
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