Wal-Mart online carries alot of the LuLu Pink and Simply Dog clothes. If your local Wal-Mart doesn't have a good supply then check online. Also you can order them from
SimplyShe - Pets
I love these brands of clothes because they fit my lil Broadway so well. Doesn't hurt that they are cheaper than a lot of other brands.
Here's my Broadway in a cute little cowgirl Simply Dog shirt:
http://i44.tinypic.com/2zh1vsj.jpg
P.S. Don't forget to check eBay for LuLu Pink and Simply Dog