» Thu Apr 07, 2011 8:28 pm
As far as I've seen, most of the general merchants and outfitters carry a few, and usually restock the next day; it isn't instantaneous. There are exceptions who don't restock, if I recall. The woodcutters may occasionally have a couple, at random, and also renew their stocks overnight. As has been mentioned, the Tailors and Dyers guild in Vivec should have plenty.
Eventually, once your cooking skill gets decent, you can boil kreshweed for the fiber and make your own thread on a spinning wheel (found in some clothiers' shops, or randomly for sale from furniture dealers in Ebonheart or Mournhold), then weave your own cloth from that thread on a loom (again, found in some shops and one or two "unusual" locations for use, or randomly for sale from the same furniture dealers). I never developed sewing skills to that level, though; making armor padding and cloth storage bags was good enough. The rate of skill advance is so slow in MC that you'll probably take months of game time to reach that point, and have made enough basic clothing in the process to outfit the entire island twice over.