You can have things custom-made that small. Any of the YT vendors can probably do that for you. There is also a site called
index that custom-makes very affordable t-shirts and can even embroider them. You might try some XXS items from
www.iseespot.com They have cute tanks. And a lot of people make sweaters out of socks for the really tiny babies.
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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.