Some FR items that should be considered:
Cloak:
Cape of the Fire Salamander (BRD)
Cloak:
Fireproof Cloak (Domo)
Shoulder:
Fireguard Shoulders (Domo)
Chest:
Black Ash Robe (Firemaw)
Bracer: Emberplate Armguards can also be of Fire Resistance, which would of course be best.
Legs:
Flamewaker Legplates (MC Naga bosses)
Legs:
Emberweave Leggings (Flamegor)
Ring: Green ring of Fire Resistance, of course (AH)
Boots:
Lavawalker Greaves (Strat UD)
Chest/Legs/Boots:
Tier 2 (Nef/Rag/Brood)
I haven't looked into NR yet, but since these crafted pieces are introduced in patch 1.11, it's probably worth it to do some research on how to stack it up when it actually matters.