While researching the tailoring stuff, I was looking at the armor sets available in TBC. Sweetness.

To browse them all yourself, go here and sort by level: http://www.wowhead.com/?itemsets#00Mz

Some priest stuff

http://www.wowhead.com/?itemset=665
I love this set bonus: If your Greater Heal brings the target to full health, you gain 100 mana.

overheal ftw!

The arena set
http://www.wowhead.com/?itemset=581
Spaming shields will be sweet.

A mage set. Not sure where it comes from.
http://www.wowhead.com/?itemset=648

Another priest set. I think this comes from dungeon tokens, or maybe rep.
http://www.wowhead.com/?itemset=663