Yeah that's the one, that's what I meant by chainmail. There just aren't any metal pants to go along with the look, it seems. I'd even take some type of leather chaps, but I don't know if there are ant.
I would probably go for the dark brown chinos or tweed pants.
Hopefully the boots cover up the pant cuffs so you just kindof get a non-conflicting pop of color/interest.
For accessories I feel like maybe the leaf would work well? I can't think of any other accessories that arent automatically Too Modern to fit, except maybe the "messy food" items.