there are alot of vanity items, some are made por tailors, but there are some tu can buy, check the AH under misc armour. o if there is a tailor in your guild they may have the patern for some already. There is also a fancy dress vendor in Moonglade, she sells 3 diffrent ones I think. And of course there is always the holiday outfits, dresses from easter, lunar festival, and navidad to name a few.
Here is the lista of vanity items on wowhead.com link