Yes made of a very coarse wool, thanks for information about the buttons.
I've found very little information regarding this design of jacket.
Most jackets I've seen from this time period don't have any pockets, and the one picture I've seen with pockets has white piping on the cuffs and shoulders, so I don't know if this is unit specific or just never had it added. That said the should look to have had officers rank on it at some point.
The seller had it listed as a model of 1896 frock jacket.