I found this costume on amazon.com and man oh man I LOVE it! I could seriously just watch him waddle around in this all day hehehe. So stinkin cute!!
Here is the link where you can purchase the costume :)
It is perfect for cold weather, you can easily put a coat underneath as I did. He was warm and the head piece kept his ears covered too. The texture of the "hair" on the costume is great too, it doesn't just look like a think fuzzy sweatshirt like some cheap costumes do.
I love the tail :)