List of fabric places, if you can't find a fabric your looking for, for your doll... along with a sewing supply link and a link to lotsa of beadings and stuff to dress up your doll's clothing.
Fabric distributers (some only ship around the US x_x):
http://www.distinctivefabric.com/: Distinctive Fabrics - I've order from them before, they're very awesome. You can get up to 10 swatches free if you sign up (also free). It also sounds like they have been offering free swatches as of lately, to all. They often have monthly coupons via email, if you sign up, also. They rather active community-wise, with contests, etc.
They pretty much have everything under the sun...
They have brocades, silks, vinyls, faux furs, short furs, felts, etcetcetc.
http://www.syfabrics.com/default.aspx: Sy Fabrics - they have, ribbons, cords, lace and suedes, too.
http://www.hartsfabric.com/: Harts Fabrics - Has ribbons and trim, vinyl, "Costume Fabric", etc.
http://www.mjtrends.com/: MJ Trends - Velvet, vinyl, "snake/gator skin" vinyls, brocades, faux fur, faux suede, stretch stuff... also latex sheeting and other materials like zippers, cords, stretch lace, etc.
Extra materials, glitz and beads to add to your sewing!:
http://www.creativityinc.com/bluemoonbeads: (Bluemoon beads) - Noir, Manor House, Tokens, Royal Boheme, Enchanted Planet, Lost & Found, Global Nomad, etc "styles" - one and the same that you will find in JOann's, Michaels, etc craft stores. I love these...
This has a lot of both pendants and beadings, and both glass/acrylic-type, and metal-type. The pendants are anywhere from plain, to intricate.... themed to jewel-like. Stones to printed metal. There are also beading projects and beading techniques.
http://www.alphastamps.com/collageitemsmetal.html: A lot of metal stuff - you can find small clock gears, buttons, stamps, chains, metal charms, "metal charms for dolls", and other decorative items.
http://www.stanssewingsupplies.com/catalogs/store.asp?pid=235220&catid=32676: Stan's Sewing Supplies - lotsa zippers and stuff... buttons, scissors, elastics, overall buckles, snaps, seam rippers, hand sewing needles, leather, etc