I've heard that you can make chihuahua sweaters out of tube socks.

My mom lives in Arkansas (I'm in Michigan) and she has a little 2.2 lb chihuahua. She can't find sweaters to fit her. I was thinking about making her some sweaters, and I heard that you could make them out of tube socks. Does anybody know where to put the holes for the front legs, how big to make them, etc?