How about a Holiday sweater??
Rena has some cute holiday sweaters on her site on the holiday & sale page and the price would probably be around $9, probably cheaper since he is only 4 pounds. If you don't want anything with a holiday print on it, you can just choose from her fabrics and customize it to look how you want it. She does a great job and the prices are great.
www.barkindogclothes.com