I made (very convincing) sky bison pajamas for myself and a matching winged lemur hoodie for my miniature dachshund Guinevere.
The patterns were altered/made/constructed/sewn by me. They took around a week from start to finish and are made from very cuddly soft double sided minky.
I have more photos and a write up on how they were made here: [link]
Note: I only ever put clothing on my dog when it's winter to protect her stomach from the snow. I would never make her wear this for more then 10 minutes. That being said, she isn't terribly opposed to wearing it. It's soft and cuddly, as said above.