ATF B-10 Critiques and general B-10 Question

Hi all,

I tried this on the repo page, but have no response.

First can anyone tell me what the pocket lining material is, cotton twill, or ...?

Second, what are the differences between the ATF B-10 and originals, besides pencil pocket, "alpaca," ...? I swapped out the collar for real mouton ("stolen" from a recycled women's 1970s overcoat).

Thanks, Jeff