Darden's armor set are pieces that drop in your backpack when killing mobs in Eodon. You cannot craft them. There are also recipes that drop in your pack to make Tiger or Turtle Armor, but these are not set pieces. You can craft them with Normal Armor if you want to reforge a property on them and then imbue them but then you can't enhance them with Colored Leather or you can craft them with colored leather and imbue them but you can't reforge them.
You need a recipe for each kind of piece. You need tiger pelt and leather to craft the tiger armor and to craft the turtle atmor, you need Dragon Turtle Scute. Tailor Craftables – Ultima Online
look for recipe needed: Yes (ToL)