French training/ NBC/ cold weather trousers????

Hi Guys.

Bought these off ebay recently, they were described as lightweight breathable Desert Trousers, but I do wonder if they are some sort of NBC trousers, I really don't know.

The lining is not like normal NBC gear, e.g Black Charcoal material, but a Blue material, which is not unalike Sweatshirt type material, they are very warm and I would imaging they will be great in winter.

My question is, has anyone here ever seen such trousers before, and could they shed any more light on them ( and before anyone moans and suggest's I look on the internet, I have with no results)

Well I feel I need to swallow some humble pie, just found a wholesaler of military surplus, and err...yeah they are NBC