I've seen shirts like this online and thought hey, I can make that! I did purchase the t-shirt (and modified it a bit) and added the cat and the pocket.
I even have a video tutorial on how to put it all together!
Check it out here: https://www.youtube.com/watch?v=x0OCbKB_9Ik
The whole shirt:
The cat and pocket! At my job I have access to a vinyl cutter and heat press, which is how I made the cat. The pocket is just fabric.
Peek-a-boo! I love how when you pull back the pocket, the rest of the cat's face is hidden in there!
Thanks for looking!