Heya, apologies if this is a fixed issue/I'm being a stupid newb, but I did several searches on this board and can't seem to find a solution: There is no reaction anywhere for the improved leather types; no "tan to tough leather" or lamellar or studded or anything in the tanner's shop, or even in the full reaction list in the job manager. The actual leather types exist, as they are brought by traders.
In the tanner's shop, the reaction list is as such:
SKILL: LEATHERWORK
SKILL: LEATHERWORKER
Tan a hide
Tan a sheared hide
Make vellum etc etc
It seems like there should be other reactions underneath that first SKILL: LEATHERWORK bit. This is the same across any fortress that I make. This is under standard dwarf mode, and yes, I do have the additional reactions for the tanner enabled.