Try something like: Category, specific categories, and then other details
For example you can have an item, category Weapon, then you can make every kind of weapon you want, for example Primary Weapon-Sword-2 Hands-Basic Damage
So you can do something like this:
/Weapons:
+Primary Weapon:
-Swords
-Axes
-Hammers
-Bows
-Crossbows
-Staffs
-Maces
-Spears
- . . .
+Secondary Weapon (if Primary is not 2 hands)
-Swords
-Axes
-Maces
-Shields
- . . .
/Protection:
+Armors
-Chainmails
-Plate mails
-Cloaks
- . . .
+Helmet:
-Helmets
-Crowns
- . . .
+Armlet:
-Bracers
-Armlets
- . . .
+Shoulders
+Boots
/Jewlery:
+Amulets
+Rings
+Orbs
These are my suggestions, If have I understood what you were asking for