Hi and welcome to YT! I have one baby named Lacy. We love doggie clothes too! Our favorite dog clothes designers are Little Lily, Hip Doggie, I See Spot, Woof, Lulu Pink, Monkey Daze, and Juicy Couture.
Http://www.glamourdog.com has some great clothes and a lot of things in XXS. Most of those designers have their own website as well and you can buy directly from some of the sites.
http://www.little-lily.com http://www.hipdoggie.com http://www.iseespot.com http://www.monkeydaze.com http://www.woofonline.com http://www.lulupink.com
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.