I required the players to find a skin (usually magical) like a dragon or fell beast that was crafted (via alchemy) into the equivalent of plate armor but made of a leather-like substance granting AT-11 (half) or AT-12 (full) suits. General rule of thumb was upper hides of dragons made AT 11/12 (sometimes 19/20) and lower (undersides) of dragons made AT-7/8 (or AT-15/16 equiv).
Enjoy,
Old Man