I would get them from someone who can custom make to your dog's measurments.
www.barkindogclothes.com makes them for like $10 which includes shipping! Go.Fetch also has great PJs and Tinkerbell's closet has cute ones too! You can give them your dog's exact measurements so they'll fit right
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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.