Its still leather, so any leather recipe will use those materials. They are just stronger(and probably heavier). You can also make specific leather armor sets in the Tailor's Workshop, for Dwarves atleast(Other races use different workshops).
Also from the Manual:
Leather/Fur = Vanilla Leather ::: Tough leather = Copper
Studded leather = Bronze ::: Lamellar leather = Iron
Chitinplate = Bronze ::: Rigid Chitinplate = Iron, but very light
Scaleplate = Bronze ::: Rigid Scaleplate = Iron, fireproof
Shellplate = Bronze ::: Rigid Shellplate = Between iron and steel, heavier.
I usually use Lamellar and Rigid Scaleplate for armor, then just sell the Rigid Shell/Chitin at one of the trading posts for Shillings.