Moonshroud

A moonshroud can be made at the Emerald Dragonshrine which is south and a little bit to the east of Wyrmrest Temple, coords is 63,73

Creating Moonshroud gives you a buff called Moonshroud Residue thats lasts 30 minutes and gives you 20 mana regeneration every 5 seconds.

The "Primal Mooncloth" of WotLK. Raw mats are:

15 Frostweave Cloth
2 Infinite Dust
20 Crystallized Life

If you are a Mooncloth tailor you will make two of these. If not, you only make one.

To make this you have to be located at the Emerald Dragonshrine. The Emerald Dragonshrine is located in Dragonblight. <Map Link>

When created, you receive the Moonshroud Residue buff: Regenerate 20 health and mana per 5 sec for 30 min.

The cooldown is 3 days and 20 hours (92 hours).

Just to make things crystal clear for tailors regarding specialization (2 procs instead of one).

If you're Spellfire spec you are immediately Spellweave spec.

If you're Shadoweave spec then you're Ebonweave spec.

And the same with Mooncloth, you're Moonshroud.

Hope this clears things up, I know it took me a little while to confirm but for those like me who were ignorant to their spell book it states in there when you hover over your cloth specialization button.

EDITING TO ADD:
You can wear whatever armor from Moonshroud, Ebonweave & Spellweave. There's no Burning Crusade restrictions anymore. The only thing that you are doing when you specialize in a particular cloth is getting that additional proc.