Tank Frost Resistance Gear

698 Armor
+18 Stamina
+9 Strength
+33 Frost Resistance
Equip: Increased Defense +7.
Enchant: Frost Mantle of the Dawn - Permanently adds 5 frost resistance to a shoulder slot item.

Glacial Cloak
Binds when equipped
61 Armor
+18 Stamina
+24 Frost Resistance
Enchant Cloak - Greater Resistance - Permanently enchant a cloak to give 5 to all resistances.

Icebane Breastplate
Binds when equipped
899 Armor
+24 Stamina
+12 Strength
+42 Frost Resistance
Equip: Increased Defense +8.
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

Icebane Bracers
Binds when equipped
393 Armor
+13 Stamina
+6 Strength
+24 Frost Resistance
Equip: Increased Defense +5.
Enchant Bracer - Superior Stamina - Permanently enchants bracers to give +9 Stamina.

Icebane Gauntlets
Binds when equipped
562 Armor
+18 Stamina
+9 Strength
+32 Frost Resistance
Equip: Increased Defense +5.
Enchant Gloves - Threat - Permanently enchant gloves to increase threat from all attacks and spells by 2%.

Unmelting Ice Girdle
Binds when picked up
452 Armor
+14 Agility
+14 Strength
+14 Stamina
+16 Frost Resistance
Equip: Increased Defense +8.

Icebane Leggings
Binds when picked up
787 Armor
+25 Stamina
+10 Strength
+40 Frost Resistance
Equip: Increased Defense +6.
Enchant: Ice Guard - Permanently adds 10 frost resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Ramaladni's Icy Grasp
Binds when picked up
+15 Stamina
+25 Frost Resistance
"Inscribed on the band: Ramaladni"

Hailstone Band
Binds when picked up
+18 Stamina
+20 Frost Resistance
Equip: Increases your chance to dodge an attack by 1%.

Loatheb's Reflection
Binds when picked up
+13 Fire Resistance
+13 Nature Resistance
+13 Frost Resistance
+13 Shadow Resistance
+13 Arcane Resistance
Use: Increases resistances to all schools of magic by 40 for 20 sec. (cooldown 2 min)

The Plague Bearer
Binds when picked up
3106 Armor
59 Block
+21 Stamina
+15 Frost Resistance
Equip: Increased Defense +9.
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

Alternate Options

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Helm of Wrath
Binds when picked up
696 Armor
+40 Stamina
+17 Strength
+10 Frost Resistance
+10 Shadow Resistance
Equip: Increased Defense +11.

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Skul's Cold Embrace
Binds when picked up
617 Armor
+20 Stamina
+19 Strength
+10 Frost Resistance
Equip: Increased Defense +6.
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

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Band of Icy Depths
Binds when picked up
+19 Stamina
+20 Frost Resistance
Equip: Allows underwater breathing.

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Ring of Binding
Binds when picked up
60 Armor
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
+10 Shadow Resistance
+10 Arcane Resistance
Equip: Increased Defense +4.

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Seal of Ascension
Binds when picked up
Unique
Finger    
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
Call of Vaelastrasz (not shown)
"Draconic runes appear and disappear along the inner band."

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Smoking Heart of the Mountain
Binds when picked up
150 Armor
+7 Fire Resistance
+7 Nature Resistance
+7 Frost Resistance
+7 Shadow Resistance

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Ward of the Elements
Binds when picked up
+8 Fire Resistance
+8 Nature Resistance
+8 Frost Resistance
+8 Shadow Resistance
+8 Arcane Resistance

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Darrowshire Strongguard
Binds when picked up
2153 Armor
40 Block
+8 Spirit
+8 Stamina
+10 Nature Resistance
+10 Frost Resistance
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

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With all this gear, you should be way past 315 Frost Resist (75% Reduction). You don't need all this gear, due to many buffs & consumables that get you to max, however this should help with any tanks still curious for gear.

Tank Nature Resistance Gear

Below is a list of gear for Nature Resist. Enjoy!

Gyth's Skull (of Nature Resistance)
Binds when picked up
509 Armor
+20 Stamina
Random Bonuses (+15 Nature Resistance)
Equip: Increased Defense +9.
Enchant: Savage Guard - Permanently adds 10 nature resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Amulet of Foul Warding
Binds when picked up
+12 Stamina
+20 Nature Resistance
Equip: +24 Attack Power.

Acid Inscribed Pauldrons
Binds when picked up
610 Armor
+16 Stamina
+12 Strength
+25 Nature Resistance
Equip: Increased Defense +6.
Enchant: Nature Mantle of the Dawn - Permanently adds 5 nature resistance to a shoulder slot item.

Green Dragonskin Cloak
Binds when picked up
54 Armor
+12 Stamina
+20 Nature Resistance
Equip: Restores 4 health per 5 sec.
Enchant Cloak - Greater Nature Resistance - Permanently enchant a cloak to give 15 nature resistance.

Ironvine Breastplate
Binds when equipped
726 Armor
+15 Stamina
+30 Nature Resistance
Equip: Increased Defense +7.
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

Noxxion's Shackles
Binds when picked up
235 Armor
+5 Stamina
+15 Nature Resistance
Enchant Bracer - Superior Stamina - Permanently enchants bracers to give +9 Stamina.

Ironvine Gloves
Binds when equipped
454 Armor
+10 Stamina
+20 Nature Resistance
Equip: Increased Defense +10.
Enchant Gloves - Threat - Permanently enchant gloves to increase threat from all attacks and spells by 2%.

Ironvine Belt
Binds when equipped
408 Armor
+12 Stamina
+15 Nature Resistance
Equip: Increased Defense +3.

Cenarion Reservist's Legplates
Binds when picked up
575 Armor
+13 Stamina
+25 Nature Resistance
Equip: Increased Defense +9.
Enchant: Savage Guard - Permanently adds 10 nature resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Acid Inscribed Greaves
Binds when picked up
559 Armor
+19 Stamina
+8 Strength
+25 Nature Resistance
Equip: Increased Defense +6.
Enchant Boots - Greater Stamina - Permanently enchant boots to give +7 Stamina.

Malfurion's Signet Ring
Binds when picked up
+17 Stamina
+20 Nature Resistance

Ring of Binding
Binds when picked up
60 Armor
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
+10 Shadow Resistance
+10 Arcane Resistance
Equip: Increased Defense +4.

Heart of Noxxion
Binds when picked up
+10 Nature Resistance
Use: Removes 1 poison effect. (cooldown 5 min)

Husk of Nerub'enkan
Binds when picked up
2089 Armor
38 Block
+10 Stamina
+15 Nature Resistance
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

Thunderfury, Blessed Blade of the Windseeker
Binds when picked up
One-hand Sword
44 - 115 Damage | Speed 1.90
+16 - 30 Nature Damage
(53.9 damage per second)
+5 Agility
+8 Stamina
+8 Fire Resistance
+9 Nature Resistance
Chance on hit: Blasts your enemy with lightning, dealing 300 Nature damage and then jumping to additional nearby enemies. Each jump reduces that victim's Nature resistance by 25. Affects 5 targets. Your primary target is also consumed by a cyclone, slowing its attack speed by 20% for 12 sec.
Enchant Weapon - Crusader - Permanently enchants a melee weapon so that often when attacking in melee it heals for 75 to 126 and increases Strength by 100 for 15 sec.

Polished Ironwood Crossbow
Binds when picked up
Ranged | Crossbow
101 - 153 Damage    Speed 3.10
(41.0 damage per second)
+5 Stamina
+7 Nature Resistance
Equip: +24 Attack Power.
Biznicks 247x128 Accurascope - Attaches a permanent scope to a bow or gun that increases its chance to hit by 3%.

Alternate Options

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Helm of the Mountain
Binds when picked up
683 Armor
+10 Nature Resistance
Equip: Increased Defense +7.
Enchant: Savage Guard - Permanently adds 10 nature resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

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Gaea's Embrace
Binds when equipped
49 Armor
+6 Stamina
+20 Nature Resistance
Enchant Cloak - Greater Nature Resistance - Permanently enchant a cloak to give 15 nature resistance.

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Silithid Carapace Chestguard
Binds when picked up
867 Armor
+23 Stamina
+17 Strength
+14 Agility
+35 Nature Resistance
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

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Ooze-ridden Gauntlets
Binds when picked up
529 Armor
+20 Stamina
+13 Strength
+25 Nature Resistance
Enchant Gloves - Threat - Permanently enchant gloves to increase threat from all attacks and spells by 2%.

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Elemental Rockridge Leggings
Binds when picked up
496 Armor
+18 Stamina
+20 Strength
+10 Nature Resistance
Enchant: Savage Guard - Permanently adds 10 nature resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

  Quote

Seal of Ascension
Binds when picked up
Unique
Finger    
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
Call of Vaelastrasz (not shown)
"Draconic runes appear and disappear along the inner band."

  Quote

Smoking Heart of the Mountain
Binds when picked up
150 Armor
+7 Fire Resistance
+7 Nature Resistance
+7 Frost Resistance
+7 Shadow Resistance

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Darrowshire Strongguard
Binds when picked up
2153 Armor
40 Block
+8 Spirit
+8 Stamina
+10 Nature Resistance
+10 Frost Resistance
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

  Quote

Rock Golem Bulwark
Binds when picked up
1994 Armor
36 Block
+10 Stamina
+10 Nature Resistance
+10 Arcane Resistance
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

  Quote

Bow of Taut Sinew
Binds when picked up
Ranged | Bow
59 - 111 Damage    Speed 2.20
(38.6 damage per second)
+8 Nature Resistance
Equip: +22 Attack Power.
Biznicks 247x128 Accurascope - Attaches a permanent scope to a bow or gun that increases its chance to hit by 3%.

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With all this gear, you should be around 315 Nature Resist (75% Reduction). You don't need all this gear, due to many buffs & consumables that get you to max, however this should help with any tanks still curious for gear.
Also don't forget you can use Heart of Noxxion Twice!

Tank Fire Resistance Gear

Below is a list of gear for Fire Resist. Enjoy!

Dark Iron Helm
Binds when equipped
758 Armor
+20 Stamina
+35 Fire Resistance
Enchant: Lesser Arcanum of Resilience - Permanently adds 20 fire resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Drakefire Amulet
Binds when picked up
+10 Stamina
+15 Fire Resistance
"The Blood of Drakkisath Flows Within..."

Dark Iron Shoulders
Binds when equipped
514 Armor
+10 Stamina
+10 Fire Resistance
Enchant: Flame Mantle of the Dawn - Permanently adds 5 fire resistance to a shoulder slot item.

Onyxia Scale Cloak
Binds when equipped
43 Armor
+7 Stamina
+16 Fire Resistance
Equip: Protects the wearer from being fully engulfed by Shadow Flame.
Enchant Cloak - Greater Fire Resistance - Permanently enchant a cloak to give 15 fire resistance.

Dark Iron Plate
Binds when picked up
817 Armor
+12 Stamina
+19 Fire Resistance
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

Dark Iron Bracers
Binds when equipped
394 Armor
+7 Stamina
+18 Fire Resistance
Enchant Bracer - Superior Stamina - Permanently enchants bracers to give +9 Stamina.

Dark Iron Gauntlets
Binds when equipped
495 Armor
+16 Stamina
+12 Agility
+28 Fire Resistance
Enchant Gloves - Threat - Permanently enchant gloves to increase threat from all attacks and spells by 2%.

Belt of Might
Binds when equipped
421 Armor
+15 Stamina
+21 Strength
+7 Fire Resistance
Equip: Increases your chance to dodge an attack by 1%.
Equip: Increased Defense +5.

Dark Iron Leggings
Binds when equipped
778 Armor
+14 Stamina
+30 Fire Resistance
Enchant: Lesser Arcanum of Resilience - Permanently adds 20 fire resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Core Forged Greaves
Binds when picked up
634 Armor
+28 Stamina
+12 Fire Resistance
+8 Shadow Resistance
Equip: Increased Defense +4.
Enchant Boots - Greater Stamina - Permanently enchant boots to give +7 Stamina.

Ocean's Breeze
Binds when picked up
+7 Agility
+4 Strength
+4 Stamina
+15 Fire Resistance

Ring of Binding
Binds when picked up
60 Armor
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
+10 Shadow Resistance
+10 Arcane Resistance
Equip: Increased Defense +4.

Onyxia Blood Talisman
Binds when picked up
+15 Fire Resistance
Equip: Increases your chance to parry an attack by 1%.
Equip: Increased Defense +8.
Equip: Restores 7 health per 5 sec.

Royal Seal of Eldre'Thalas
+10 Fire Resistance
Equip: +200 Armor.
"Blessed by the Shen'dralar Ancients."

Draconian Deflector
Binds when picked up
2153 Armor
40 Block
+7 Stamina
+10 Fire Resistance
Equip: Increased Defense +10.
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

Alcor's Sunrazor
Binds when equipped
One-hand Dagger
41 - 77 Damage | Speed 1.30
(45.4 damage per second)
+10 Fire Resistance
Chance on hit: Blasts a target for 75 to 106 Fire damage.

Alternate Options

Gyth's Skull (of Fire Resistance)
Binds when picked up
509 Armor
+20 Stamina
Random Bonuses (+15 Fire Resistance)
Equip: Increased Defense +9.
Enchant: Lesser Arcanum of Resilience - Permanently adds 20 fire resistance to a leg or head slot item. Does not stack with other enchantments for the selected equipment slot.

Blazefury Medallion

Binds when picked up
+13 Agility
+14 Stamina
+12 Fire Resistance
Equip: Adds 2 fire damage to your melee attacks.

Fiery Chain Shoulders

Binds when equipped
299 Armor
+14 Intellect
+10 Stamina
+25 Fire Resistance
Enchant: Flame Mantle of the Dawn - Permanently adds 5 fire resistance to a shoulder slot item.

This is what you should use over Dark Iron Shoulders

Pauldrons of Wrath

Binds when picked up
642 Armor
+27 Stamina
+13 Strength
+10 Fire Resistance
Equip: Increases the block value of your shield by 27.
Equip: Increased Defense +7.

Hydralick Armor

Binds when equipped
567 Armor
+13 Strength
+20 Stamina
+8 Agility
+10 Fire Resistance
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

Breastplate of the Chromatic Flight

Binds when picked up
706 Armor
+30 Stamina
+20 Strength
+10 Agility
+15 Fire Resistance
Enchant Chest - Major Health - Permanently enchant a piece of chest armor to grant +100 health.

Emberplate Armguards (of Stamina)

Binds when picked up
261 Armor
+10 Fire Resistance
Random Bonuses (+15 Stamina)
Enchant Bracer - Superior Stamina - Permanently enchants bracers to give +9 Stamina.

Fiery Chain Girdle

Binds when equipped
214 Armor
+10 Stamina
+9 Intellect
+8 Spirit
+24 Fire Resistance

Dark Iron Boots (of the Bear)

Binds when equipped
664 Armor
+28 Fire Resistance
Random Bonuses (+11 Strength)
Random Bonuses (+11 Stamina)
Enchant Boots - Greater Stamina - Permanently enchant boots to give +7 Stamina.

Seal of Ascension

Binds when picked up
Unique
Finger    
+10 Fire Resistance
+10 Nature Resistance
+10 Frost Resistance
Call of Vaelastrasz (not shown)
"Draconic runes appear and disappear along the inner band."

Smoking Heart of the Mountain

Binds when picked up
150 Armor
+7 Fire Resistance
+7 Nature Resistance
+7 Frost Resistance
+7 Shadow Resistance

Ward of the Elements

Binds when picked up
+8 Fire Resistance
+8 Nature Resistance
+8 Frost Resistance
+8 Shadow Resistance
+8 Arcane Resistance

Skullflame Shield

Binds when equipped
2256 Armor
40 Block
+10 Fire Resistance
+10 Shadow Resistance
Equip: When struck in combat has a 3% chance of stealing 35 life from target enemy.
Equip: When struck in combat has a 1% chance of dealing 75 to 126 Fire damage to all targets around you.
Enchant Shield - Greater Stamina - Permanently enchant a shield to give +7 Stamina.

With all this gear, you should be around 315 Fire Resist (75% Reduction). You don't need all this gear, due to many buffs & consumables that get you to max, however this should help with any tanks still curious for gear.

A Resist set should equally value Stam and Resist on a 1:1 ratio.

Fire Resist:

Helm of Might w/ +20 FR. should be strongly considered and is equal to if not better than Dark Iron Helm.  Provides 10 less points of Stam + FR than Dark Iron Helm, however gives dodge, 7 def and 30 unbuffed AP.

Shoulders:

Pauldrons of Wrath  (second BiS) Provides 17 more points of Stam + FR than Dark Iron Shoulders - which you state.  Also gives block value for shield slam damage, 7 def and 26 unbuffed AP.

Fireguard Shoulders (BiS) Provides 30 more points of Stam + FR than Dark Iron Shoulders, better than T2 for pure FR on Rag.  For tank + FR T2 shoulders for BWL drakes and MC trash.

Cloak:

Fireproof Cloak  (BiS)

Chest:

Breastplate of Wrath Provides 10 5 more points of Stam + FR than Chromatic Flight.  Also the high def is > the avoidance from agility gained on Chromatic Flight

Bracer:

Bracelets of Wrath Provides 2 more points of Stam + FR (they have no FR), but gives more EHP and AP.  I'd highly recommend that Wristguards of True Flight be used once you obtain your other BiS pieces to increase threat in your FR set.  I understand not adding to list though since no FR on them.

Gloves:

Gauntlets of Might Highly recommended as well as an alternative to obtain the + threat, though for a pure FR standpoint, Dark Iron gloves are better for EHP+FR.

Belt:

Lava Belt (BiS)

Legs:

Emberweave Leggings (BiS)

Boots:

Sabatons of Wrath (BiS) Same Stam+FR as Core Forge but more Def and Block Value for threat, and 26 unbuffed AP.

Ring Slot 2 (to pair with Ocean's Breeze)

Archimitro's Ring of Reckoning for increased EHP, or Band of Accuria (or any +hit ring) for more threat depending on raid dps. No FR on the item I understand if not on the list.

Trinket Slot 2: (to pair with Onyxia's Trinket)

Blazing Emblem (BiS)  use the cooldown in the event that your pally gets knocked back out of range, dies, or shammy totem expires, shammy dies.

Weapon:

Thunderfury, Blessed Blade of the Windseeker (BiS) More EPH+FR than Alcors, + threat.  You mentioned it on NR set so you should have on FR set as well.

Dark Iron Reaver More EPH+FR than Alcors

Ebon Hand More EPH+FR than Alcors, DPS and has a proc.

Shield:

Elementium Reinforced Bulwark is (BiS) due to the high EHP and increased shield slam damage once you get other BiS FR pieces.  No FR on the item I understand if not on the list.