Sorry- I viewed the shots of the model wearing them and have since decided that they look a little too slim cut. You may want to search for a pair of pants that are a little more baggy.
If you're talking close enough, I think they'd work well. They are a bit slimmer, but I'd prefer that over baggy since I'd wear them in non gear situations, and I dislike anything overly baggy.
The LL Bean trousers have long been a popular close enough Indy pant. My first Indy pants were a pair in taupe, and I still have and wear them. They are quality pants for the money. What's more, I see them frequently at thrift stores. I got my pair for $3.50, so it might be worth checking out your local thrift stores for a pair.
The color of these is good. Even the grey ones for some rola scenes.
I wondered if you could find similar but with double pleats in cavalry twill, should'nt be too hard to find.
JTW.
The ones that Twilekjedi posted are probably LL Bean's closest "close enoughs." The wool ones only have the edge as far as material. The dress chinos have the flaps and the pleats, but are made of cotton twill. Then, there's the microfiber ones, which have a better color, called taupe, which are closer to the wool versions in the first post.
It's all a matter of what aspects are more important to you.