Mooncloth

In order to craft Mooncloth, you must be at a Moonwell. Here are all the current locations:

Kalimdor
Teldrassil: Various settlements, including Dolanaar
Darnassus: Temple of the Moon
Darkshore: Auberdine
Ashenvale: Raynewood Retreat (59, 59)
Ashenvale: Shaeldryn's moonwell, east of Iris Lake (53, 46)
Ashenvale: Southern moonwell, east of Mystral Lake (60, 72)
Stonetalon Mountains: Stonetalon Peak
Moonglade: Nighthaven
Thousand Needles: Thalanaar
Desolace: Nijel's Point
Feralas: Feathermoon Stronghold, Thalanaar, Dire Maul
Felwood: Jaedenar
Felwood: Ruins of Constellas
Silithus: Cenarion Hold (48, 37)
Tanaris: Caverns of Time (near the entrance for the Battle of Mount Hyjal, but as of 4/6/07 does not create primal mooncloth)

Eastern Kingdoms
Stormwind: In The Park district
Duskwood: In the Twilight Grove

Outland
Zangarmarsh: Cenarion Refuge (80,64)
Blade's Edge Mountains: Evergrove (62, 39)
Blade's Edge Mountains: Sylvanaar (37, 63)
Terokkar Forest: Cenarion Thicket (45, 24)

EDIT: Typo.

As of Patch 2.4.3: 'Removed the cooldown from regular Mooncloth'

The felcloth needed for this can be farmed by killing the satyrs in felwood and azshara. Theyre about lvl 55 and are easy to kill. They drop greens, darkmoon cards, money, recipes and you can pick pocket them. Mooncloth sells for about 12 g a pop and its used for high lvl tailoring recipes.

You need a moonwell to make this. Theres only one in eastern kingdoms at the park in SW. Its next to the druid trainers. Theres a lot on kalimdor. Darnassus in the temple, felwood, silithus and ashenvale.