Well, my disenchants are as follows.
Silk: Long silken cloak, takes 1 mana potion, so I save them all in bank and do them en masse. Give a nice amount of greater mystic essence.
Mageweave: Red mageweave shoulders. Give out nice Greater nether essence, and some dream dust.
Runecloth: Nothing too great, they all use rare mats, such as ironweb spider silk. I recently got the wizardweave robes pattern for cheap, and that's a good source of greater eternal essence and illusion dust. 3 robes (24 bolts of runecloth, 6 dream dusts, 3 rune thread) gave me 2 illusion dust, and 3 greater eternal essence.
Mooncloth: You must be kidding, right?