This site shows how to make a dog sweater out of a sock.
MAKE | How-To: Make a Dog Sweater from a Sock One girl here who had a large yorkie found a part of leg warmers at the dollar store and make a sweater out of one of them. This site has some cute things to make from pet placemats to tuxedos.
Projects to sew for your pets and another site has some good instructions for making all sort of things for pets.
Homemade Dog Clothes Don't overlook buying baby clothes and making a dog clothes out of them. The dollar store sells baby clothes as well as places like Good Will and it won't break the bank.
http://www.yorkietalk.com/forums/yt-...e-clothes.html