[Britster]

I agree on Walmart- their Simply Dog line fits Jax AWESOME!!! I've always loved their stuff. I've also found a fair share of nice things on eBay and Etsy.com.

Ummm... there's a few sites I have bookmarked but have never bought anything because too much $$$ but here's some:
Dog Clothes | Dog Clothing | Dog Accessories | FunnyFur.com
Biker Dog Clothes | Motorcycle Dog Carriers | Dog Helmets - Rockstar Puppy
Custom Small Dog Clothes, Designer Dog Clothes, & Accessories
Punk Rock Dog Clothes, Punk Dog Collars, Punk Dog Accessories, Punk Rock Cat Collars
bowwowsbest.com
Designer Dog Clothes, Dog Costumes & Dog Carriers