the models was made using Marvelous Design 6 and some details come from zbrush.
High Poly file with 1.772M poly counts .fbx/.obj
Low Poly file with 6.749 poly count .fbx/.obj
You can find them individually at the following links:
https://www.cgtrader.com/3d-models/character/clothing/military-pants-snow-camuflage
https://www.cgtrader.com/3d-models/character/clothing/military-pants-desert
https://www.cgtrader.com/3d-models/character/clothing/military-pants-forest-camuflage