Wool / Linen: Quill Boars in The Barrens would be easy kills. Same with the centaurs.
You left out whether you're Alliance or Horde, but if you're Horde and are doing the Stonetalon quests the harpies in the Charred Vale and the humanoids in Windshear Craig will also be a good source of wool / linen and you can quest at the same time as those quests are in that level range, perhaps a wee bit below but will still yield nice xp.
Basically, go to where the humanoids are. You'll end up with plentiful cloth and the cash you need to purchase your tailoring mats.