I ordered two shirts for Matthias from
http://www.ruffruffandmeow.com/ and let me tell you the service is fast and great! I ordered on Friday and got the shirts Monday afternoon!! And the quality is AWSOME!! And unlike Petsmart clothes, these fit him perfectly!!!! Totally worth the money! Just wanted to put my recommendation in for ya.
in case you were wondering, I got the "Security" and "I love my Mommy" shirts.