OG Helmut Lang bondage pants? I think Lanvin had something similar too... also, the APC x Kanye army pants were pretty much that. Otherwise EG highland pant or maybe hunter if you're ok with front pockets.
Brown homespun bedford AND ghurka pant already sold out in my size at TBB... hopefully some US stockist will have one or both by the weekend. Olive moleskin bedford might make a decent consolation prize.