The Li'l Pals harnesses I have seen are in a figure-8 style and I know Petsmart carries harnesses that are figure-8 style in bigger sizes than the Li'l Pals so I would look there. My parent's yorkie has one in red.
Here is a link to a figure-8 harness. It is showing a large on on a lab but they make them just a little bigger than the Li'l Pals size you are using now
http://www.petsmart.com/global/produ...N=2032961&Ne=2
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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.